Definition of “watchword” - English Dictionary

british dictionary

“watchword” in British English

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watchwordnoun [ C usually singular ]

uk /ˈwɒtʃ.wɜːd/ us /ˈwɑːtʃ.wɝːd/

(a word or phrase that represents) the main ideas or principles directing the way that someone behaves or the way that something is done:

And remember, let caution be your watchword.

(Definition of “watchword” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)