to slip up

listen to the pronunciation of to slip up
English - English
To err, falter; to make a mistake

I hope I don't slip up during my presentation.

{f} make a mistake, make an error, fail
If you slip up, you make a small or unimportant mistake. There were occasions when we slipped up see also slip-up
make an error; "She slipped up and revealed the name"
to slip up
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