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1. verb To harm or damage someone or something. A noun or pronoun can be used between "batter" and "up." That accident battered up the door of my car. I think that kid will listen to us if we batter him up a bit and scare him.
2. noun An expression used to summon the next batter to home plate in a baseball game. Let's get this game started. Batter up!
batter someone or something up
to damage or harm someone or something. Max threatened to batter Lefty up within an inch of his life. Who battered up this desk?