Source : Webster's Revised Unabridged Dictionary (1913)

Bumble \Bum"ble\, n. [See {Bump} to boom.] (Zo["o]l.)
   The bittern. [Local, Eng.]

Bumble \Bum"ble\, v. i.
   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.

Source : WordNet®

bumble
     v 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" [syn: {botch},
           {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: walk unsteadily; "The drunk man stumbled about" [syn: {stumble},
         {falter}]
     3: speak haltingly; "The speaker faltered when he saw his
        opponent enter the room" [syn: {stutter}, {stammer}, {falter}]