keep down
phrasal verbkeep down
keep somebody down
to prevent a person, group, etc. from expressing themselves freely synonym oppress压制(或限制、控制)某人
keep something down
to make something stay at a low level; to avoid increasing something 使保持在低水平;抑制某事物的增长 to not bring something back through the mouth from the stomach; to not vomit 不使(胃中食物)吐出;不呕吐