a system in which tips (= extra money that customers give) are collected together and shared out among all the staff in a restaurant

The head waiter will donate some of the money to the restaurant's tronc. 领班服务员将把一部分钱捐给饭店的小费箱。

His restaurants operate a tronc system and the service charge is shared among the staff. 他经营的餐厅有一套平分小费的做法，获得服务费由全体员工平分。