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Complain (v. i.) To give utterance to expression of grief, pain, censure, regret. etc.; to lament; to murmur; to find fault; -- commonly used with of. Also, to creak or squeak, as a timber or wheel.
Complain (v. i.) To make a formal accusation; to make a charge.
Complain (v. t.) To lament; to bewail.