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

1.
einchecken, stempeln
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.
Ich muss bis 9 Uhr morgens einchecken, um nicht zu spät zu kommen.
•
He always clocks on exactly at 8 AM.
Er stempelt immer genau um 8 Uhr morgens ein.