1
general::
Phrase(s): clock someone out
to observe and record someone’s time of departure. • Jane clocked herself out and went home., Phrase(s): clock out
to record one’s time of departure, usually by punching a time clock. • I will clock out just before I go home. • Jim clocked out early Tuesday to go to the doctor.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
End work, as in Please wait for me; I forgot to clock out. The allusion here is to punching a time clock, a device that punches the time on a card to record when an employee arrives and departs. [Late 1800s]
American Heritage Idioms