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Most prepositions have at least one metaphorical extension of their familiar basic meaning
METAPHORICAL MEANING IN ENGLISH
Meaning called metaphorical (or “figurative”) is able to be expressed by many English expressions as an alternative to an older, more basic meaning from which it has developed. This development usually occurs as a result of language users gradually recognising that some abstract part of a basic meaning also exists in other things. For example, the metaphorical meaning of root (as in the root of the problem) is “cause” because that idea is also present in the same word’s basic meaning of “underground plant root”, the origin of plant growth.
Metaphorical meaning can exist in words, phrases and even sentences (for example proverbs). For an extensive list of phrase-based examples, see 241. Some Common Figurative Phrases. Readers whose vocabulary knowledge is still fairly restricted are likely to have a particular problem with metaphorical meaning, since they will often know only a basic meaning and will not always recognise when its corresponding metaphorical one is being used instead (see 7. Reading Obstacles 4).
Words with metaphorical meaning tend to belong to the four largest word classes: verbs, nouns, adjectives and adverbs. There are numerous examples in the above-mentioned reading post, as well as elsewhere within this blog in posts like 137. Words that Reflect English Culture and 278. Colours.
However, even prepositions sometimes have a metaphorical meaning, usually different from the one they acquire when they become adverbs (see 154. Lone Prepositions after BE). These meanings are often much less well known than the familiar ones, but this should not be a surprise when so many small words in English have the ability to be used in an unfamiliar way (see 256. Unusual Meanings of Familiar Words).
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METAPHORICAL MEANING AND PREPOSITION USE
The metaphorical meanings that I wish to discuss here are associated with a particular use of prepositions. There are three main preposition uses: as independent words, as part of a grammatical structure, and in collocations especially with a verb, noun or adjective.
Prepositions as independent words tend to be the first kind taught in English language courses. Many have as their fundamental meaning a position or direction in space or time (on the ground, into town, after breakfast), a feature reflected in the very name “preposition”. However, there are plenty that have a different fundamental meaning, including despite, worth and most multi-word prepositions, such as according to and in terms of (see 221. Multi-Word Prepositions).
The key feature of prepositions as independent words is that they are not determined by the choice of one or more neighbouring words: their own meaning is the main reason for their choice, and they can usually be replaced by plenty of other prepositions (to express different meanings) without making the sentence structurally different or ungrammatical. For example, in before the house has such obvious alternatives as by, under, above, beyond, through and out of. Despite this independence, however, these prepositions are like all others in needing to go, along with their partner noun, in specific parts of their sentence (see 84. Seven Things to Know about Prepositions, #2).
By contrast, the other two preposition uses are much more dictated by the choice of neighbouring words. Grammatical prepositions are needed in particular grammatical constructions – by after passive verbs for example. Collocational prepositions depend on the choice of individual words. For example the adjective prone usually needs to after it, while the verb cope needs a following with before any object noun. For fuller details of these categories, along with additional examples, see 111. Words with a Typical Preposition.
Metaphorical preposition meanings seem to be especially possessed by prepositions in the first of the three categories. They may be illustrated with the preposition under, which can mean not just “physically covered by” but also “hierarchically supervised by”, as when we say that employees work under a manager. I am not saying that metaphorical meanings are absent from the other categories: by after passive verbs and to after prone may each be metaphorically linked somehow with their independent meanings “next to” and “in the direction of”. However, metaphorical meanings in the first category seem particularly striking and common.
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PREPOSITIONS WITH A METAPHORICAL MEANING
The following uses are notable, though they are probably nowhere near all of the possibilities. Some also feature in 164. Fixed Prepositional Phrases, where they are more collocational.
ABOVE: (a) more important than (above all, above their own interests); (b) not tempted by (+ immoral action) (above corruption, above exploiting the poor).
AFTER: (a) trying to get (after some food, after a good time, after more money); (b) honouring through imitation (named after the founder, a song after Bob Dylan).
AROUND: approximately (+ quantity) (around 100 people, around 16.00 hours). See 95. Making Statements More Uncertain 1, #2.
BEHIND: (a) invisibly causing (people behind a crime, motives behind a behaviour, a theory behind a policy: see 306. Ways of Giving a Reason, #3); (b) failing to match (behind schedule, behind the times, behind the leading team); (c) supporting (+ person, idea or action) (behind a speaker, behind a proposal, behind a new start).
BELOW: less than (below par, below expectation, below normal, below the limit).
BENEATH: (a) hidden by (beneath a facial expression, beneath kind words); (b) considered unworthy by (+ person) (beneath the manager – describing, for example, economy class travel).
BETWEEN: shared by or involving two people/things (divided between…, a disagreement between…).
BEYOND: (a) outside or disallowing (beyond doubt, beyond redemption, beyond reproach, beyond repair); (b) better than (beyond expectation, beyond requirements).
OFF: (a) temporarily breaking the routine of (off duty, off food, off travelling); (b) below the normal level (off one’s best, off colour).
ON: (a) dealing with (on a case, on a problem, on business); (b) conveying information through (+ medium) (on TV, on the phone, on a map, on film, on a screen: see the end of 111. Words with a Typical Preposition).
ONTO: investigating after recent discovery (onto a disease source, onto criminal activity).
ON TOP OF: (a) successfully managing (+ demanding task or problem) (on top of one’s job, on top of life’s trials); (b) in addition to (humiliation on top of defeat: see 81. Tricky Word Contrasts 2, #2).
OUT OF: (a) no longer occupying (+ correct place) (out of position, out of alignment, out of bounds, out of sorts, out of touch); (b) caused by (+ emotion or knowledge state) (out of gratitude, out of ignorance: see 72. Causal Prepositions).
OVER: (a) more than (+ amount) (over six hours, over 1000 people, over the limit); (b) caused by or concerning (+ source of argument) (arguing over money, disputes over procedures); (c) recovered from (+ major event) (over the worst, over their illness, over a holiday); (d) throughout (+ time period) (over a lifetime, over the course of many years).
THROUGH: using or with the help of (+ person/s) (through a friend, through local representatives).
UNDER: (a) hierarchically supervised by (under the command of…, under a manager); (b) happening during the rule of (under the Republicans, under the … Dynasty); (c) receiving/suffering (under pressure, under attack, under an illusion, under consideration, under the influence of …); (d) according to (+ written rules) (under an agreement, under the regulations).
WITH (starting a sentence): because of (+ noun + describing word/s) (With the problem solved,… , With everyone in agreement,…: see 88. Exotic Grammar Structures 1, #7.
In addition to these single prepositions, there are some multi-word ones with a clearly metaphorical use. In tune with can refer not just to musical appropriacy (violins in tune with cellos) but also to many other kinds (decisions in tune with a policy, rules in tune with a culture). In line with can indicate a correspondence of not just one object or position with another but also of a behaviour or belief with a law, policy or expectation.
In light of means “helped by light from”, but is almost exclusively metaphorical (e.g. in light of events): to be non-metaphorical one would probably say in/by the light of instead (see 235. Special Uses of “the”, #8). Similarly, in the wake of rarely has its basic meaning of “in the white water behind (a ship)”, much more typically just meaning “after”; and owing to expresses not debt but a reason (see 246. Tricky Grammar Contrasts 2, #3).
Some of the above words retain a metaphorical use – sometimes the same one, sometimes different – when they are used alone, without a partner noun. For example, we can say that food is off, meaning that it has gone bad. In such cases the words are probably adverbs rather than prepositions. For a full discussion, see 154. Lone Prepositions after BE.