stumble-v; 3 Senses

Sense Number 1: trip; walk as if about to fall

Examples:
She stumbled over the books on the floor.
As he stumbled about, he ran right into a tree.

Mappings:
VerbNet: run-51.3.2
FrameNet: Self_motion
PropBank: stumble.01
WordNet 3.0 Sense Numbers: 1, 2

Sense Number 2: encounter by chance

Examples:
At last, he's stumbled onto something good.
I stumbled across some information you may find interesting.

Mappings:
VerbNet: NM
FrameNet: NM
PropBank: NM
WordNet 3.0 Sense Numbers: 3

Sense Number 3: make an error

Examples:
The Japanese have watched the Europeans and Canadians stumble in the U.S. market.
They stumbled when asked how many siblings Kevin had, finally agreeing
on three brothers and three sisters.
Unfortunately, they stumbled by crafting a game that's too simple for strategy
gamers, and too convoluted for kids.

Mappings:
VerbNet: NM
FrameNet: Bungling
PropBank: stumble.01
WordNet 3.0 Sense Numbers: 4