verb (used with object), pla·cat·ed, pla·cat·ing.
- to appease or pacify, especially by concessions or conciliatory gestures: to placate an outraged citizenry.
- a piece of plate armor of the 15th to the 18th century protecting the lower part of the torso in front: used especially as a reinforcement over a breastplate.
- (tr) to pacify or appease
v.1670s, a back-formation from placation or else from Latin placatus “soothed, quiet, gentle, calm, peaceful,” past participle of placare “to calm, appease, quiet, soothe, assuage,” related to placere “to please” (see please). Related: Placated; placating; placatingly.