Meaning of “grunt” - Learner’s Dictionary

grunt

verb uk us /ɡrʌnt/
PERSON [ I, T ]

to make a short, low sound instead of speaking, usually when you are angry or in pain

PIG [ I ]

If a pig grunts, it makes short, low sounds.

grunt noun [ C ]

(Definition of “grunt” from the Cambridge Learner’s Dictionary © Cambridge University Press)