Definition of clock in phrasal verb from the Oxford Advanced Learner's Dictionary

 

clock in

 phrasal verb
phrasal verb Office life
 
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Phrasal Verbs

clock in

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clock on

(British English)(North American English punch in)
 
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to record the time at which you arrive at work, especially by putting a card into a machine Staff should clock in on arrival. I clock on at 8 a.m. See related entries: Office life
See the Oxford Advanced American Dictionary entry: clock in