complain

Concise Oxford English Dictionary © 2008 Oxford University Press:
complain/kəmˈpleɪn/

▶verb

• 1 express dissatisfaction or annoyance.

• 2 (complain of) state that one is suffering from (a symptom of illness).

– derivatives
complainer noun,
complaining adjective,
complainingly adverb.

– origin ME: from OFr. complaindre, from med. L. complangere ‘bewail’, from L. com- (expressing intensive force) + plangere ‘to lament’.