1) Ball up 2) Be all thumbs 3) Behave clumsily 4) Blow 5) Bobble 6) Bollix 7) Bollix up 8) Bollocks 9) Bollocks up 10) Botch 11) Botch up 12) Bungle 13) Exclusively Anglo word 14) Exclusively Saxon word 15) Fail 16) Flub 17) Fluff 18) Foul up 19) Fuck up 20) Fumble 21) Go wrong 22) Louse up 23) Make a mess of 1) Bobble 2) Bollix 3) Bollocks 4) Err 5) Falter 6) Mishandle 
• (v. i.) To make a hollow or humming noise, like that of a bumblebee; to cry as a bittern. • (n.) The bittern.
Bum'ble intransitive verb To make a hollow or humming noise, like that of a bumblebee; to cry as a bittern. « As a bittern bumbleth in the mire. Chaucer. » Bum'ble noun [ See Bump to boom.] (Zoology) The bittern. [ Local, Eng.]
Bumble was old slang for a beadle, so named after the character in the book Oliver Twist.
[v] - speak haltingly
stutter verb speak haltingly; `The speaker faltered when he saw his opponent enter the room`