Definition of slip up in US English:

slip up

phrasal verb

informal
  • Make a careless error.

    ‘they often slipped up when it came to spelling’
    • ‘Usually they just let you keep slipping up, spending more than you have in your account so that they can slap on the €12.70 bounced cheque fee or the hefty interest surcharge if you become overdrawn.’
    • ‘As these volumes demonstrate, scholars take endless pleasure in drawing attention to the great man's shortcomings, as it is in the moments when he slips up that Holmes becomes almost human.’
    • ‘The boy pretends he is a lawyer but keeps slipping up.’
    • ‘Was there not enough space to print the truth or has someone been slipping up on their research skills?’
    • ‘While most of their main rivals were slipping up, the Tanners beat 10-man Dulwich Hamlet 2-1 on Saturday.’
    • ‘I have done December and January, I slipped up on February - the short month passing by as I waited for a good day that never came.’
    • ‘There is of course many a slip twixt the cup and the lip but really it borders on the impossible to visualise them slipping up this time.’
    • ‘They had slipped up in regard to Mr. Egan's date of birth, Mr. Collins said.’
    • ‘At the end, the Chinese mistress of ceremonies slipped up by saying ‘goodbye’ in Japanese.’
    • ‘It will have occurred in one of the local borough support offices, where somebody has slipped up and not informed that officer, and there can be no excuse for it.’
    • ‘She only feels ill when she slips up and eats dairy products.’
    • ‘With closest rivals Radcliffe Borough and Eastwood Town continually slipping up in their bid to catch up on the runaway leaders, John Reed's men now have a nine-point advantage and at least four games in hand.’
    • ‘He seemed forever on edge, worried about slipping up or uttering something to upset the assembled crowd.’
    • ‘His Liverpool team is showing signs of improvement with every game that hint of even better things to come next season, and with Leeds slipping up again, second place in the Premiership is not such a fanciful notion.’
    • ‘He never slips up, because he is a world-class survivor of media onslaught.’
    • ‘Now one vaccine manufacturer slipping up would not be a major problem if there were lots more manufacturers ready to step into the breach.’
    • ‘Charles Kennedy may have slipped up on a tax question at their policy briefing, but this was probably down to sleep deprivation after the birth of his new baby son!’
    • ‘It is said in Washington that a gaffe is when someone slips up and tells the truth.’
    • ‘So I slipped up a bit, having a bit more caffeine than I probably should, but only when on vacation and with family.’
    • ‘But she slipped up and gave a secret about whether she and her husband Ben Affleck are expecting a boy or a girl.’
    make a mistake, blunder, make a blunder, get something wrong, miscalculate, make an error, trip up, err, go wrong
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