To Stumble

1. (intransitive) To trip or fall; to walk clumsily.
2. (intransitive) To make a mistake or have trouble.
3. (transitive) To cause to stumble or trip.
4. (transitive, figurative) To mislead; to confound; to cause to err or to fall.
5. To strike or happen (upon a person or thing) without design; to fall or light by chance; with on, upon, or against.