"stumble" in the noun sense
1. lurch, stumble, stagger
an unsteady uneven gait
2. trip, trip-up, stumble, misstep
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"
"stumble" in the verb sense
1. stumble, falter, bumble
"The drunk man stumbled about"
2. stumble, trip
miss a step and fall or nearly fall
"She stumbled over the tree root"
3. stumble, hit
encounter by chance
"I stumbled across a long-lost cousin last night in a restaurant"
4. stumble, slip up, trip up
make an error
"She slipped up and revealed the name"
Source: WordNet® (An amazing lexical database of English)
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