| invalidate(upset, break, oppose, expose, contest) |
| keep down(expression, dampen, quieten, muffle, shush) |
| keep quiet |
| keep secret(verb, expression, restrain, crush, curb) |
| lack of sound(expression, idiom) |
| laconism(noun, calm, quiet, speech, absence) |
| mitigate(verb, calm, soothe, repress, appease) |
| mum |
| pipe down(verb, expression, phrasal verb, calm, dull) |
| placidity(noun, calm, quiet, rest, restraint) |
| quiescence(noun, stop, calm, break, quiet) |
| quiet down(verb, expression, phrasal verb, calm, dull) |
| reserve(noun, calm, control, quiet, command) |
| choke off(verb, expression, phrasal verb, calm, break) |
| allay(verb, calm, quiet, subdue, relax) |
| be silent(expression, idiom) |
| bottle up(verb, expression, calm, quiet, restrain) |
| closeness(noun, reserve, concealment) |
| cork(verb, stop, quiet, restrain, crush) |
| cut off(verb, expression, phrasal verb, calm, break) |