To make bitter or sour.
To exasperate; to irritate.
Embittered; having a sour disposition or nature.
To make a groan.
To seemingly creak under the strain of being heavily laden.
A low, mournful sound uttered in pain or grief.
A low, guttural sound uttered in frustration, disapproval, or ecstasy.
A low creaking sound from applied pressure or weight.