Definition of under adverb from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈʌndə(r)//
    ; NAmE NAmE//ˈʌndər//
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  1. 1  below something He pulled up the covers and crawled under.
  2. 2  below the surface of water She took a deep breath and stayed under for more than a minute. The boat was going under fast.
  3. 3  less; younger prices of ten dollars and under children aged 12 and under
  4. 4in or into an unconscious state He felt himself going under.
  5. Word OriginOld English, of Germanic origin; related to Dutch onder and German unter.
See the Oxford Advanced American Dictionary entry: under