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Related to slip up: blunder
to make an error. I hope you don't slip up again. Try to be more careful.
slip up something
to climb something, slipping along the way. The hikers slipped up the wet slope. Ted slipped up the stairs, tracking mud and water as he went along.
to make a mistake It was unusual for him to slip up that way and forget a meeting.
Make a mistake, blunder, as in I slipped up and gave the invitations to the wrong people. [Mid-1800s]
1. To make a mistake or blunder; err: I slipped up when I said my plane would arrive at 6:00 am—I meant 6:00 pm.
2. To cause someone to make a mistake or blunder: The change in plans slipped me up and I went to the wrong subway station. The false clue slipped up the detective.
1. in. to make an error. Don’t slip up and pay this bill twice, please.
2. and slip(-up) n. an error. That was a silly slip-up. I’m sorry.