Verb keep down has 3 senses
  1. number, keep down - place a limit on the number of
    --1 is one way to limit, circumscribe, confine
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. repress, quash, keep down, subdue, subjugate, reduce - put down by force or intimidation; "The government quashes any attempt of an uprising"; "China keeps down her dissidents very efficiently"; "The rich landowners subjugated the peasants working the land"
    --2 is one way to oppress, suppress, crush
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
    Something ----s somebody
  3. keep down - manage not to throw up
    Antonyms:
    vomit, vomit up, purge, cast, sick, cat, be sick, disgorge, regorge, retch, puke, barf, spew, spue, chuck, upchuck, honk, regurgitate, throw up
    Sample sentence:
    Somebody ----s something
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