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English definition of “clock in”

clock in

(UK also clock on) informal phrasal verb with clock     /klɒk/ US  /klɑːk/ verb [T]
to record the time you arrive at work on a special machine: What time did you clock in this morning? Clocking-in time is 9.00 a.m. Working hours and periods of workWork, working and the workplace
(Definition of clock in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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