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")
smother, stifle, strangle, muffle, repress -- (conceal or hide; "smother a yawn"; "muffle one's anger"; "strangle a yawn")
suppress, repress -- (put out of one's consciousness)
(Sound)
