bumble in WordNet English dictionary

1. make a mess of, destroy or ruin
   "I botched the dinner and we had to eat out"; "the pianist screwed up the difficult passage in the second movement"
   botch  bodge  bumble  fumble  botch up  muff  blow  flub  screw up  ball up  spoil  muck up  bungle  fluff  bollix  bollix up  bollocks  bollocks up  bobble  mishandle  louse up  foul up  mess up  fuck up 
   
2. speak haltingly
   "The speaker faltered when he saw his opponent enter the room"
   bumble  stutter  stammer  falter 
   
3. walk unsteadily
   "The drunk man stumbled about"
   stumble  falter  bumble