Stumble
WordNet
noun
(1) An unintentional but embarrassing blunder
"He recited the whole poem without a single trip"
"He arranged his robes to avoid a trip-up later"
"Confusion caused his unfortunate misstep"
(2) An unsteady uneven gait
verb
(3) Make an error
"She slipped up and revealed the name"
(4) Miss a step and fall or nearly fall
"She stumbled over the tree root"
(5) Walk unsteadily
"The drunk man stumbled about"