Meaning of “clock in” in the English Dictionary

british dictionary

(Definition of “clock in” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"clock in" in Business English

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clock in

UK also clock on, US also punch in
phrasal verb with clock uk /klɒk/ us verb [ I ]

WORKPLACE to begin work, especially by recording the time you arrive at work on a special machine:

What time did you clock in this morning?
We are supposed to clock in before 9.00 a.m.

(Definition of “clock in” from the Cambridge Business English Dictionary © Cambridge University Press)