clock in

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clock in [phrasal verb]

to record the time you arrive at work on a special machine

US /klɑːk/ 
UK /klɒk/ 
Example: 

What time did you clock in this morning?

Longman Dictionary of Contemporary English

clock in/on phrasal verb especially British English
to record on a special card the time you arrive at or begin work SYN punch in American English:
I clock on at 8:30.

Oxford Advanced Learner's Dictionary

clock in

ˌclock ˈin/ˈon derived
(BrE) (NAmE ˌpunch ˈin) 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.

Main entry: clockderived

Cambridge Advanced Learner's Dictionary

clock in ( UK also clock on ) informal — phrasal verb with clock / klɒk /   / 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.

Collins Advanced Learner’s English Dictionary

clock in

 PHRASAL VERB
 When you clock in at work, you arrive there or put a special card into a device to show what time you arrived.
  [V P] I have to clock in by eight.
 Ant:
 clock off

Merriam-Webster's Advanced Learner's Dictionary

clock in/on [phrasal verb] chiefly Brit : to record on a special card the time that you start working
• What time did you clock on?
• I clocked in [=(US) punched in] 10 minutes late.