Complain (verb)

1. To express dissatisfaction or annoyance about something.
2. To express pain or discomfort.
3. To make a formal accusation or charge.

Origin:

Late middle english: from old french complaindre, from latin complangere, from com- "together" + plangere "to strike".

Examples:

1. He complained about the service.
2. She complained of a headache.
3. They complained to the manager.
4. The customer complained about the quality of the product.
5. He complained to the authorities about the injustice.