[1] : WordNet (r) 2.0

slip up
     v : make an error; "she slipped up and revealed the name" syn:
         stumble, trip up
see also:
stumble trip up 

[2] : Moby Thesaurus II by Grady Ward, 1.0

20 moby thesaurus words for "slip up":
   blunder, bungle, deviate, err, fall into error, foozle, go amiss,
   go astray, go awry, go wrong, goof, lapse, miscalculate, miss,
   miss the mark, slip, stray, stumble, trip, wander

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Bang Up >> B Words
Bang Up, definition of term: Bang Up
bang+up_pag1.html

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html