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[T] to hit someone or something forcefully with the flat inside part of your hand, producing a short loud noise, especially as a way of punishing a childI never smack my children.
I'll smack your bottom if you don't behave yourself.
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[I or T usually + adverb or preposition] to hit something hard against something elseI smacked my head on the corner of the shelf.
She smacked her books down on the table and stormed out of the room.