Definition of keep down phrasal verb from the Oxford Advanced American Dictionary

 

keep down

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to hide yourself by not standing up straight Keep down! You mustn't let anyone see you.

keep somebodydown

 
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to prevent a person, group, etc. from expressing themselves freely synonym oppress The people have been kept down for years by a brutal regime. You can't keep Laura down—she's so full of life.

    keep somethingdown

     
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  1. 1 to make something stay at a low level; to avoid increasing something to keep down salaries/prices/the cost of living Keep your voice down—I don't want anyone else to hear. Keep the noise down (= be quiet).
  2. 2to not bring something back through the mouth from the stomach; to not vomit She's had some water but she can't keep any food down.
See the Oxford Advanced Learner's Dictionary entry: keep down