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English definition of “under”

under

preposition (EXPERIENCING)    /ˈʌn.dər/ US  /-dɚ/
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 .Simultaneous and consecutiveOrder and sequence 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 .Experiencing and suffering 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 .Treating and caring for peopleDoctors and health workers generallyPeople who receive medical treatment be under an impression/belief B2 to believe something, often wrongly : He was under the mistaken belief that I was in charge .Believing Grammar:UnderUnder is a preposition. When we use under as a preposition, it is similar to below. We use under to talk about something that is below or lower than something else:
(Definition of under preposition (EXPERIENCING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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