From Middle English complaynen, from Old French complaindre, from Medieval Latin complangere (“to bewail, complain”), from Latin com- (“together”) + plangere (“to strike, beat, as the breast in extreme grief, bewail”); see plain, plaint.
complain (third-person singular simple present complains, present participle complaining, simple past and past participle complained)
- To express feelings of pain, dissatisfaction, or resentment. Joe was always complaining about the noise made by his neighbours.
- To make a formal accusation or bring a formal charge. They've complained about me to the police again.
- To creak or squeak, as a timber or wheel. the complaining bed-springs