Definition from Wiktionary, the free dictionary
From Middle English bemenen, bimenen, from Old English bemǣnan (“to bemoan, bewail, lament”), equivalent to be- (“about, concerning”) + moan. Alteration of vowel from Middle to Modern English due to analogy with moan.
- (transitive) to complain about; to dismay or worry about something
- He bemoaned the drought but went on watering his lawn.