noun, noun or participle which takes 'suru', intransitive verb
overtime work; working overtime
Refers to work done beyond regular hours, typically in a company setting. Can be used as a noun or with する to mean 'to work overtime'.
今月は残業が多すぎる。
There's too much overtime this month.
昨日は遅くまで残業した。
I worked overtime until late yesterday.
Compound of 残 (remaining, left over) and 業 (work, business), literally 'remaining work'.