a relatively small amount of money given for services rendered (as by a waiter)
同义词：gratuity??/??tip??/??pourboire??/??bakshish??/??bakshis??/??backsheesh
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。