请问into piece是什么意思？

cut somebody into pieces 是将某人碎尸万段的意思，参考理解吧，呵呵

break into/to pieces
1. (使)成为碎片
The cup fell and was broken into pieces.
茶杯掉下去,砸成碎片。

变成碎片。

成碎片。tear into piece撕成碎片。break into piece碎成碎片。