noun

1. a group of persons, animals, or, formerly, things; herd, flock, band, etc.
2. loosely a great number; lot
3. 1. a body of soldiers
   2. soldiers 45 troops were killed
4. 1. a subdivision of a mounted cavalry regiment
   2. an armored cavalry unit that corresponds to a company of infantry
5. a unit of Boy Scouts or Girl Scouts under an adult leader
6. Archaic a group of actors; troupe

Etymology: Fr troupe < OFr, back-form. < troupeau < ML troppus, a flock < Frank *throp, a crowd; akin to OE thorp, village: see thorp

intransitive verb

1. to gather or go together in a throng the crowd trooped out of the stadium
2. to walk, go, or pass children were trooping along the sidewalk
3. Archaic to associate or consort