stumble

(noun) an unsteady uneven gait. Synonyms: lurch, stagger.

(noun) an unintentional but embarrassing blunder. Synonyms: trip, trip-up, misstep. Examples: "He recited the whole poem without a single trip." "He arranged his robes to avoid a trip-up later." "Confusion caused his unfortunate misstep."

(verb) walk unsteadily. Synonyms: falter, bumble. Example: "The drunk man stumbled about."

(verb) miss a step and fall or nearly fall. Synonyms: trip. Example: "She stumbled over the tree root."

(verb) encounter by chance. Synonyms: hit. Example: "I stumbled across a long-lost cousin last night in a restaurant."

(verb) make an error. Synonyms: slip up, trip up. Example: "She slipped up and revealed the name."