WordWeb Online

1. A slogan used to rally support for a cause
   "our watchword will be 'democracy'";
   - war cry, rallying cry, battle cry, cry
    
2. A secret word or phrase known only to a restricted group
   "he forgot the watchword";
   - password, word, parole, countersign

Derived forms: watchwords

Type of: arcanum, catchword, motto, positive identification, secret, shibboleth, slogan

Encyclopedia: Watchword