Dic: a shift (one of its meanings as a noun)

• His father worked shifts in a steel mill.

[NOUN] | If a group of factory workers, nurses, or other people work shifts, they work for a set period before being replaced by another group, so that there is always a group working.

1. Each of these set periods is called a shift.
2. You can also use shift to refer to a group of workers who work together on a particular shift.

.... Cobuild via Naver

[동사 + shift] do, work | be on, come on, go on | be off, come off, finish, go off | change

• I'm doing the early shift this week.
• He works the night shift.
• I didn't realize that I'd have to work shifts.
• It was 8 a.m. and the nurses were changing shifts.
• My husband changed his shifts from afternoons to nights.

... Some other source via Naver