noun
Often used for negative or questionable deeds, but can refer to any act attributed to someone. Common in phrases like ~の仕業だ (it's the work of ...).
これは誰の仕業だ?
Whose doing is this?
いたずらは弟の仕業に違いない。
The prank must be my little brother's doing.
Compound of 仕 (し, 'to do') and 業 (わざ, 'work, deed'). The reading しわざ is a straightforward combination of the on'yomi of 仕 and the kun'yomi of 業.