slip

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slip up

1. 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. 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 or after "slip" and "up." I have to concentrate while I do this, so please don't talk and screw me up! She always uses intimidation tactics to try and 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 we may have to let him go. He was overcharged due to a slip-up by the IRS.
See also: slip, up

slip

verb
See: