| mutate | (verb) undergo mutation | - |
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| mute | (verb) deaden (a sound or noise), especially by wrapping | Synonyms: damp, dampen, dull, muffle, tone down |
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| mutilate | (verb) destroy or injure severely | Synonyms: mar |
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| (verb) damage or injure severely | Synonyms: cut up, mangle |
| (verb) alter so as to make unrecognizable | Synonyms: mangle, murder |
| mutiny | (verb) engage in a mutiny against an authority | - |
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| mutter | (verb) make complaining remarks or noises under one's breath | Synonyms: croak, gnarl, grumble, murmur |
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| (verb) talk indistinctly; usually in a low voice | Synonyms: maunder, mumble, mussitate |