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British Dictionary definitions for keep under

keep under

verb
  1. to remain or cause to remain below (a surface)
  2. (tr, adverb) to cause to remain unconscious
  3. (tr, adverb) to hold in submission
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012