1.
act, deed, doing, work (usually negative or mischievous)
An action or deed, almost always used to attribute blame or responsibility for something bad or mischievous.
Common patterns
Usage: Almost exclusively used in negative contexts — mischief, crime, damage, or blame. Rarely used for positive actions. Common in mystery stories, news reports, and when attributing blame.
Note: Can also be used humorously for minor mischief: お菓子が消えたのは子どもの仕業だ (The disappearing sweets were the children's doing).