verb (used without object) 1.to strike the foot against something, as in walking or running, so as to stagger or fall; trip.
2.to walk or go unsteadily: to stumble down a dark passage.
3.to make a slip, mistake, or blunder, especially a sinful one:
to stumble over a question; to stumble and fall from grace. 4.to proceed in a hesitating or blundering manner, as in action or speech (often followed by along).
5.to discover or meet with accidentally or unexpectedly (usually followed by on, upon, or across): They stumbled on a little village.
EXPAND6.to falter or hesitate, as at an obstacle to progress or belief.
COLLAPSE