樂不思蜀

乐不思蜀
shǔ
  1. (derogatory) to have so much fun that one forgets one's origins, or that one has to return; to indulge in pleasure and forget home and duty; to be too happy to be homesick
  2. to have so much fun that one forgets one's origins, or that one has to return; to indulge in pleasure and forget home and duty; to be too happy to be homesick

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