From the verb phrase slip up.
slip-up (plural slip-ups)
- (idiomatic) A mistake or error; a minor misstep.
- I think she will forgive an accidental slip-up, so don't worry too much about misspeaking.
2012 June 29, Kevin Mitchell, “Roger Federer back from Wimbledon 2012 brink to beat Julien Benneteau”, in the Guardian:
- For the second year in a row at Wimbledon, Roger Federer went to five sets against a Frenchman but this time there would be no slip-ups.
a small error