watchword /ˈwɒtʃˌwɜːd/

• 1. 

  N-COUNT Someone's watchword is a word or phrase that sums up their attitude or approach to a particular subject or to things in general. 口号; 格言

  例：

  Caution has been one of Mr. Allan's watchwords.

  “谨慎”是艾伦先生的格言之一。