stumble
- sense 1: walk unsteadily
- stumble falter bumble
- sense 2: miss a step and fall or nearly fall; "She stumbled over the tree root."
- stumble trip
- sense 3: encounter by chance; "I stumbled across a long-lost cousin last night in a restaurant"
- stumble hit
- sense 4: make an error
- stumble blunder slip_up trip_up