to make a careless mistake
Either he was tracking the wrong boy, or somebody had made a very serious slip-up indeed.
I'd maybe wanted to ask other questions but I shut up now after the past tense slip-up.
They start asking questions---what if I slip up, say the wrong thing?
When you’re a politician everyone is always watching in case you slip up.
`Just thought I'd slip up and straighten your room while you boys were eating," she said.
slips up
slipping up
slipped up
There is no origin for this phrasal verb
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