To complain; to express dissatisfaction or make a complaint about something or someone.
彼はいつも文句を言うので、一緒に働くのが疲れる。
He always complains, so it's tiring to work with him.
サービスに不満があるなら、黙っていないで文句を言ったほうがいい。
If you're unhappy with the service, it's better to complain instead of staying silent.
子どもが宿題をしたくないと文句を言うのはよくあることだ。
It's common for children to complain that they don't want to do their homework.
上司に文句を言う前に、まず自分で状況を整理したほうがいい。
Before complaining to your boss, it's better to organize the situation yourself first.