definition of
keep down

[1] #1 keep down v. place a limit on the number of. wn

[2] #2 keep down v. 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". wn

[3] #3 keep down v. manage not to throw up. wn