See stifle in Webster's New World Roget's A-Z Thesaurus II
verb
To hold (something requiring an outlet) in check:
burke, choke (back), gag, hold back, hold down, hush (up), muffle, quench, repress, smother, squelch, strangle, suppress, throttle. (Informal) sit on (or upon). See restraintTo decrease or dull the sound of:
dampen, deaden, muffle, mute. See increase, soundsTo keep from being published or transmitted:
ban, black out, censor, hush (up), suppress. Idiom: keep (or put) a lid on. See showTo stop the breathing of:
asphyxiate, choke, smother, suffocate. See breath
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