Definition of punch in (or out) in US English:

punch in (or out)

phrasal verb

North American
  • Register one's arrival at (or departure from) work, especially by means of a time clock.

    ‘she couldn't punch in, because there were no time clocks’
    • ‘I watched her absently walk over to the clock and punch out.’
    • ‘Does the president of General Motors go down and check out as the shift punches out and changes?’
    • ‘The greatest feeling I get as an entrepreneur is when I go into the back, into the facility here and to see the employees punching out on their time cards to go home and on payday to know that I've contributed to their livelihood.’
    • ‘Now, each employee has an individual code number and has to punch in and out every day.’
    • ‘Before Ian could jam his card into the clock to punch out, Dupont called him from the office.’
    • ‘Danmar regularly had employees punch out after 40 hours and then forced them to continue working.’
    • ‘A week later, when they tried to punch in, security guards told them they'd been fired.’
    • ‘In the middle of a transaction I excused myself for ‘just a moment’ went to the cloak room, grabbed my belongings, punched out and ran home.’
    • ‘The absolute worst work condition we ever heard about was a 1960's factory where the owner made all workers punch out on the time clock to use the bathroom.’
    • ‘This is not to say that every government employee checks his brain and his principles at the door when he punches in for the first time.’