to utter the deep short guttural sound typical of a pig

to utter a similar sound, e.g. in reluctant agreement or during strenuous exertion when suffering from the effects of exertion

to say (something) with a deep voice and in a muted way that suggest irritation, disgust, or unwillingness to speak openly

a grunting sound

the deep short guttural sound of a pig

a muted speech sound that expresses irritation, disgust, or reserve

a low sound produced as a result of exertion

NAmer, informal

a tropical seafish that makes a grunting sound when taken out of the water: family Pomadasyidae