Dictionary definition · stumble
noun
- an unsteady uneven gait
- an unintentional but embarrassing blunder"he recited the whole poem without a single trip"
verb
- walk unsteadily, tripping repeatedly"The drunk man stumbled about"
- miss a step and fall or nearly fall"She stumbled over the tree root"
- encounter by chance"I stumbled across a long-lost cousin last night in a restaurant"
- make an error"She slipped up and revealed the name"
Source: Open English WordNet (CC BY 4.0).