To walk heavily or clumsily. He stumped across the room in his heavy boots.
To baffle or confuse someone, especially with a difficult question or problem. The tricky math problem stumped the entire class.
To campaign or make political speeches, especially by traveling from place to place. The candidate stumped through several states to gather support for the election.
In cricket, to dismiss a batsman by dislodging the bails with the ball while the batsman is out of his ground and not attempting a run. The wicketkeeper stumped the batsman with a quick throw.
To clear (land) of tree stumps by uprooting or blasting them. Early settlers had to stump the fields before they could start planting crops.