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to be lazy; to be idle; to slack
to neglect (e.g. one's work); to be neglectful of; to skip (e.g. school)
最近ずっと懶けてばかりいる。
I've been doing nothing but slacking off lately.
懶けていると体力が落ちてしまう。
If you're idle, your stamina will decline.
夏休みに懶けた分を取り戻したい。
I want to make up for the time I wasted in summer break.