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To cleave someone or something into several or many pieces. A noun or pronoun can be used between "slice" and "up." Would you slice up this bread for me so we can make some sandwiches? It was gruesome—the turbine sliced the poor guy up into tiny bits.
slice someone or something up
to cut someone or something up into slices. The blades of the lawn mower can slice you up if you get too close. The sharp blades sliced up Bobby's rubber ball.
To cut or divide something into slices: We sliced up the loaf of bread and made sandwiches. The developer sliced the estate up into three-acre lots.