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.

To lament; to bewail.

express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about"

To make a formal accusation; to make a charge.

make a formal accusation; bring a formal charge; "The plaintiff's lawyer complained that he defendant had physically abused his client"

to send a message there is a problem. A consumer might complain with a phone call or letter to the seller. If this does not work, a government agency or the courts may be asked to intervene.