muttering

n [U] (also mutterings[pl]) complaints that are privately or not openly expressed 私下的抱怨.

musty, mutability, mutable, mutant, mutate, mutation, mutatis mutandis, mute, muted, mutely, muteness, mutilate, mutilation, mutineer, mutinous, mutinously, mutiny, mutt, mutter, mutterer, mutton, mutton-head, mutual, mutual funds, mutual insurance, mutually, Muzak, muzzily, muzziness, muzzle, muzzle velocity, muzzy, MV, MW, my, my God, mycology, myelitis, mynah (also myna, mina), myopia,