to say that something is wrong or not satisfactory
The workers complained that they were being treated unfairly.
After receiving a damaged product, the customer decided to complain to the company's customer service department.
The passengers were quick to complain about the flight delay, expressing their frustration with the airline staff.
Employees have the right to complain if they experience unfair treatment or workplace harassment.
Rather than silently accepting the subpar performance, the team decided to complain to upper management about the lack of resources hindering their success.
