noun / verb
grunt
GRUHNT/ɡrʌnt/
A brief, low sound made in the throat.
The man grunts as he raises a heavy sack.

Etymology
Old English grunnettan was a frequentative form of a verb meaning “to grunt,” suggesting repeated sounds. Its origin was probably imitative of the sound itself.
In context
At 75 volts, you hear him grunt. At 120, he shouts that it's painful.
More examples
- She answers with a grunt instead of a greeting.
- The pigs grunt as they crowd around the feeder.
- He lets out a grunt of effort while pushing the couch.
Forms
grunt · grunts · grunted · grunting