Top Definition
1. a word or short phrase to be communicated, on challenge, to a sentinel or guard; password or countersign.
2. a word or phrase expressive of a principle or rule of action; slogan: Conservation has been our watchword.
3. a rallying cry of a party, club, team, etc.
"Normal is the watchword" Veronica Mars Season 2 Ep 1
by XanderHe October 20, 2006
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