code word

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

palabra clave, contraseña

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.
Los espías usaban una palabra clave específica para identificarse entre sí.
Only those who knew the code word were allowed to enter.
Solo aquellos que conocían la palabra clave tenían permitido entrar.