marcher
/ˈmɑrʧər/Definitions
1. noun
a person who marches, especially one who participates in a ceremonial march or procession, or one who marches as part of a military unit.
“The marcher led the parade through the city streets.”
2. noun
a device that converts the mechanical energy of a marching band into electrical energy to power a sound system or other equipment.
“The marching band used a marcher to amplify their music.”