/ bɪˈməʊn; NAmE bɪˈmoʊn/ verb
[ vn ] ( formal ) to complain or say that you are not happy about sth :
They sat bemoaning the fact that no one would give them a chance.
••
WORD ORIGIN
Old English bemǣnan complain, lament . The change in the second syllable (16th cent.) was due to association with moan , to which it is related.