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English definition of “under”

under

adverb     /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 .Under and below 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 adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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