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to complain about; to grumble about; to moan about; to bemoan
体調にかこつけて仕事を休んだ。
I used my health as a pretext to skip work.
彼は自分の不運をかこった。
He bemoaned his bad luck.
老人は孤独をかこっている。
The old man is lamenting his loneliness.