"bumble" in the verb sense
1. 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
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"
2. stumble, falter, bumble
walk unsteadily
"The drunk man stumbled about"
3. bumble, stutter, stammer, falter
speak haltingly
"The speaker faltered when he saw his opponent enter the room"
Source: WordNet® (An amazing lexical database of English)
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