n. 25B6; verb
he stumbled and fell heavily : TRIP (OVER/UP), lose one's balance, lose/miss one's footing, slip.
he stumbled back home : STAGGER, totter, teeter, dodder, blunder, hobble, move clumsily.
he stumbled through his speech : STAMMER, stutter, hesitate, falter, speak haltingly; informal fluff one's lines.
25A0; stumble across/on COME ACROSS/UPON, chance on, happen on, light on; discover, find, unearth, uncover; informal dig up.