| chloroform(verb, dull, quiet, diminish, impair) |
| choke back(verb, expression, stop, restrain, curb) |
| clam(verb, calm, dull, quiet, suppress) |
| clamp(verb, restrain, crush, overcome, curb) |
| clamp down(verb, expression, stop, restrain, curb) |
| clamp down on(expression, idiom, quiet, restrain, repress) |
| close up(verb, expression, calm, dull, quiet) |
| collect(verb, restrain, crush, block, curb) |
| conk |
| conquer(verb, restrain, crush, overcome, curb) |
| console(verb, calm, subdue, relax, satisfy) |
| constipate(verb, stop, restrain, curb, suppress) |
| constrain(verb, control, restrain, curb, suppress) |
| consume(verb, dull, quiet, diminish, impair) |
| contain(verb, control, restrain, crush, block) |
| cool(verb, dull, reduce, restrain, crush) |
| cool out(verb, expression, calm, subdue, relax) |
| cope |
| cork up(verb, expression, quiet, restrain, curb) |
| counterfeit(obscure, alter, hide, cloak) |