clock in
US /klɑːk ɪn/
UK /klɑːk ɪn/

1.
fichar, registrar la entrada
to record one's arrival at work, especially by punching a time clock
:
•
I need to clock in before 9 AM.
Necesito fichar antes de las 9 AM.
•
Don't forget to clock in when you arrive.
No olvides fichar cuando llegues.