1. a paperboard sign or notice, as one posted in a public place or carried by a demonstrator or picketer.
2. Armor. placate2 . verb (used with object)
3. to display placards on or in: The square was placarded by peace marchers.
4. to publicize, announce, or advertise by means of placards.
5. to post as a placard.
"wavings can be placard."
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