casting vote
noun [ S ] uk/ˌkɑː.stɪŋ ˈvəʊt/ us/ˌkæs.tɪŋ ˈvoʊt/
（赞成票与反对票相等时会议主席所投的）决定性一票
a single vote, given by the person in charge of a meeting if the number of votes about something is equal, that decides the matter
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。