slip up
• make a careless error.
• "they often slipped up when it came to spelling"
Similar:
make a mistake,
blunder,
make a blunder,
get something wrong,
miscalculate,
make an error,
trip up,
err,
go wrong,
make a boo-boo,
screw up,
make a howler,
muff something up,
boob,
cock something up,
drop a clanger,
make a bloomer,
goof up,
slip-up
noun
• a minor or careless mistake.
• "we can't afford another slip-up"
