a word or phrase that must be spoken by a person in order to pass a guardthe guard demanded the countersign
the guard demanded the countersign
password, watchword, word
shibboleth, signsignalhint, indicationparole
in 1591
英语同义词词典收录了63618条英语词条,基本涵盖了全部常用同义词或反义词的辨析及翻译,是英语学习的有利工具。