prey on sb's mind idiom
使焦虑不安;使耿耿于怀
If a problem preys on your mind, you think about it and worry about it a lot.
I lost my temper with her the other day and it's been preying on my mind ever since. 前几天我对她发火了，从那以后这件事一直让我惴惴不安。
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