Verb
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speak haltingly
"The speaker faltered when he saw his opponent enter the room"
-
walk unsteadily
"The drunk man stumbled about"
-
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 up - screw up - ball up - muck up - bollix up - bollocks up - louse up - foul up - mess up - fuck up