髀肉复生（髀肉復生）　

◎ 髀肉复生 bìròu-fùshēng

(1) [having put on flesh again on the thigh]∶因为长久不骑马驱驰,生活安逸,大腿上的肉又长起来了

(2) [a sign of regret at his inactivity]∶懊悔久处安逸,无所作为的叹息