Slip-up (noun)

A small mistake or oversight.

Origin:

From 'slip' + 'up'.

Examples:

1. It was just a slip-up, no need to worry.
2. The team had been doing well until a slip-up cost them the game.
3. He usually pays close attention to detail, but this time he made a slip-up.
4. The slip-up in the budget was quickly corrected.
5. A slip-up in communication led to the mix-up in the delivery schedule.