clock in

Từ điển Oxford Advanced Learner 8th

ˌclock ˈin/ˈon derived
(BrE) (NAmE ˌpunch ˈin)to record the time at which you arrive at work, especially by putting a card into a machine
•Staff should clock in on arrival.
•I clock on at 8 a.m.
Main entry: ↑clock_derived