watchword

/ˈwɒt͡ʃwɜː(ɹ)d/

noun

A word used as a motto, as expressive of a principle, belief or rule of action; a rallying cry.
Similar: byword, catchword, mantra, maxim, motto
A prearranged reply to the challenge of a sentry or a guard; a password or signal by which friends can be known from enemies.
Similar: passphrase, password, underword

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