groan

Concise Oxford English Dictionary © 2008 Oxford University Press:
groan/ɡrəʊn/

▶verb

• 1 make a deep inarticulate sound conveying pain, despair, or pleasure.

• 2 make a low creaking sound when pressure or weight is applied.

• 3 (groan beneath/under) be oppressed by.

▶noun a groaning sound.

– derivatives
groaner noun,
groaning adjective,
groaningly adverb.

– origin OE grānian, of Gmc origin; prob. rel. to grin.