Definition of slip up in English:

slip up

informal Make a careless error: they often slipped up when it came to spelling
More example sentences
  • As these volumes demonstrate, scholars take endless pleasure in drawing attention to the great man's shortcomings, as it is in the moments when he slips up that Holmes becomes almost human.
  • She only feels ill when she slips up and eats dairy products.
  • It is said in Washington that a gaffe is when someone slips up and tells the truth.
make a mistake, blunder, make a blunder, get something wrong, miscalculate, make an error, trip up, err, go wrong
informal make a bloomer, make a boo-boo, screw up, make a howler, muff something up
British informal boob, cock something up, drop a clanger
North American informal goof up
See parent entry: slip

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