[bum.ble] vi bum.bled ; bum.bling [ME bomblen to boom, of imit. origin] (15c) 1: buzz
2: drone, rumble
[2]bumble vb bumbled ; bumbling [perh. alter. of bungle] vi (1532) 1: blunder; specif: to speak ineptly in a stuttering and faltering manner
2: to proceed unsteadily: stumble ~ vt: bungle -- bum.bler n -- bum.bling.ly adv