Definitions

1. noun

a loud, usually short, explosive utterance, typically of pain or effort

“He let out a grunt as he lifted the heavy box.”

2. verb

to make a loud, usually short, explosive utterance, typically of pain or effort

“She grunted as she struggled to free herself from the mud.”

3. verb

to growl or make a low, grumbling sound

“The dog grunted at the stranger approaching the house.”