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English definition of “under”

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under

preposition uk   /ˈʌn.dər/ us    /-dɚ/

under preposition (LOWER POSITION)

A1 in or to a position below or lower than something else, often so that one thing covers the other: He hid under the bed. In AD 79 the city of Pompei was buried under a layer of ash seven metres deep. She put the thermometer under my tongue. She was holding a file under her arm (= between her upper arm and the side of her chest). They stood under a tree (= below its branches) to avoid getting wet. specialized geography If a piece of land is under a particular type of plant, that plant is growing on the whole of that area: The main fields are under wheat. If a book, article, or piece of information is under a particular title, you can find it below or following that title in a list, book, library, etc.: Books on Cecil Beaton will probably be under Art or Photography rather than Drama. Trifle? That comes under Puddings and Desserts.
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under preposition (LESS THAN)

A2 less than: All items cost/are under a pound. The discount applies only to children under (the age of) ten (= younger than ten). If you get under 50 percent, you've failed the exam.
Opposite
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under preposition (EXPERIENCING)

B2 happening during, as a result of, or according to a particular situation, event, rule, etc.: The work was completed under very difficult conditions. Now that the deadline is approaching we all feel under pressure. The chair broke under his weight (= because he was too heavy for it). Under the present rules, you can buy ten litres of wine.under attack, consideration, discussion, etc. B2 in the process of being attacked, considered, discussed, etc.: The town is under fire (= is being attacked) from the air. The proposals are now under consideration by the Board of Governors. The situation is still not under control.under sedation, anaesthetic, etc. UK treated in the way mentioned: The patient is being kept under heavy sedation. She'll have to go under anaesthetic for the operation. old-fashioned She's been under the doctor for a viral infection.be under an impression/belief B2 to believe something, often wrongly: He was under the mistaken belief that I was in charge.
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under preposition (CONTROL)

controlled or governed by a particular person, organization, or force: He's a Colonel, with hundreds of soldiers under him (= obeying his orders). I wonder what Britain was like under the Romans (= during the time when the Romans controlled Britain). People born under (= during the period of) the star sign Pisces are supposed to be dreamy and artistic.be under orders to have been ordered to do something: They're under strict orders not to discuss the situation. He's under doctor's orders (= has been told by a doctor) to cut down on fatty food and to drink no alcohol for at least six months.
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under preposition (NAME)

using a particular name, especially one that is not your real name: He writes under the name (of) John le Carré. For his own safety, he has to operate under a false name/an alias.

under

adverb uk   /ˈʌn.dər/ us    /-dɚ/
below the surface of something: Because I'm a bad swimmer, I often go under and swallow a lot of water.
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(Definition of under preposition, adverb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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