slip up
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1. verb To blunder; to make a mistake or an error. I think I slipped up and sent the check to the wrong address. Wow, it looks like the accountants must have really slipped up this time.
2. verb To interfere with someone or their ability to do something; to cause someone to make a mistake or an error. In this usage, a noun or pronoun can be used between "slip" and "up." I have to concentrate while I do this, so please don't talk and slip me up! She always uses intimidation tactics to try to slip up her opponents.
3. noun A minor mistake, blunder, or mishandling. In this usage, the phrase is usually hyphenated. He's had one too many slip-ups in the office, so I think we have to let him go. He was overcharged due to a slip-up on our end.
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.
slip up
to make an error. I hope you don't slip up again. Try to be more careful.
slip up
Make a mistake, blunder, as in I slipped up and gave the invitations to the wrong people. [Mid-1800s]
slip up
v.
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.
slip (up)
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.