clock on
US /klɑːk ɑːn/
UK /klɑːk ɑːn/

1.
fichar, registrar la entrada
to record one's arrival at work, especially by punching a time clock
:
•
I need to clock on by 9 AM to avoid being late.
Necesito fichar antes de las 9 AM para no llegar tarde.
•
He always clocks on exactly at 8 AM.
Él siempre ficha exactamente a las 8 AM.