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to record one's time of arrival, usually by punching a time clock. What time did she clock in? She forgot to clock in today.
clock someone in
to observe and record someone's time of arrival. The manager says he clocked you in at noon. That's a bit late, isn't it?
Begin work, as in She clocked in late again. Also, clock out, 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]
1. To begin an activity at some recorded time, as by stamping the time on a timecard: The workers must clock in before 8:00.
2. To be measured as having some speed: The fastest bicycle riders clocked in at over 40 miles per hour.
3. To complete a task or activity after some duration of time: The slowest cars in the race clocked in at 12 minutes.
in. to record one’s arrival at a set time. He clocked in three minutes late.