noun A minor mistake, blunder, or mishandling. In this usage, the phrase is often hyphenated. He's had one too many slip-ups in the office, so I think we have to let him go.

How do you use slip up in sentences?

Obviously there has been a slip-up in the machinery. There had been a slip-up in the office. Unless there is any slip-up, the tunnel will he built and operating by 1993. That was due to a minor administrative slip-up—"a bank error in your favour", as they say.

Is slip up informal?

lapse, slip-up. Informal: fluff.