彈冠相慶 [ㄊㄢˊ ㄍㄨㄢ ㄒㄧㄤ ㄑㄧㄥˋ; tan2 guan1 xiang1 qing4] lit. to flick dust off sb's cap (idiom); to celebrate an official appointment to congratulate and celebrate (promotion, graduation etc) ◄ ►