stumble (
http://definr.com/stumble)
n 1: an unsteady uneven gait [syn:
lurch,
stagger]
2: an unintentional but embarrassing blunder; "he recited the
whole poem without a single trip"; "confusion caused his
unfortunate misstep" [syn:
trip,
misstep]
v 1: walk unsteadily [syn:
falter,
bumble]
2: miss a step and fall or nearly fall: "She stumbled over the
tree root." [syn:
trip]
3: encounter by chance; "I stumbled across a long-lost cousin
last night in a restaurant" [syn:
hit]
4: make an error [syn:
blunder,
slip up,
trip up]