To make a low rumbling sound; mutter; growl.
To complain in a low, surly voice; murmur with discontent.
Synonyms To complain, repine, croak.
To express or utter in a grumbling or complaining manner.
noun.
The act of grumbling; a grumbling speech or remark.
noun.
A surly person.
noun.
plural A grumbling, discontented mood; a fit of the spleen.