Chinese

		to pat or beat one's thighs	to heave a sigh; to lament; to bemoan
trad. (撫髀興嘆/撫髀興歎)		撫髀	興嘆/興歎
simp. (抚髀兴叹)		抚髀	兴叹

Idiom

撫髀興嘆

1. to sigh in disappointment (said of one living in retirement but still burning with ambition)