a low, continuous sound, as of a brook, the wind, or trees, or of low, indistinct voices.

a mumbled or private expression of discontent.

Also called heart murmur. Medicine/Medical .

an abnormal sound heard on listening to the heart, usually through a stethoscope, produced by the blood passing through deformed cardiac valves.

in some persons a similar sound heard when blood passes through normal valves.

Phonetics . a voice quality in which vibration of the vocal cords is accompanied by the escape of a great deal of air, as in the (h) of ahead; breathy voice.

to make a low or indistinct sound, esp. continuously.

to speak in a low tone or indistinctly.

to complain in a low tone or in private.

to sound by murmurs.

to utter in a low tone

He murmured a threat as he left the room.

noun

complainer , crab , faultfinder , growler , grumbler , grump , mutterer , whiner