Definition

a complaint letter: a written letter in which someone reports a bad experience or situation idiom
to complain: to moan, to express dissatisfaction or a negative opinion verb
  • "I have a number of side projects I'll be working on, including a short story commission, some journalistic work, and a complaint letter to the local council."
  • "Making your secretary take down, and then type, a complaint letter about herself is extremely cruel."

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