code word

US /ˈkoʊd wɜːrd/
UK /ˈkoʊd wɜːrd/
"code word" picture
1.

mot de code, mot de passe

a word or phrase that has a secret meaning and is used to give a message or signal

:
The spies used a specific code word to identify each other.
Les espions utilisaient un mot de code spécifique pour s'identifier mutuellement.
Only those who knew the code word were allowed to enter.
Seuls ceux qui connaissaient le mot de code étaient autorisés à entrer.