What is the meaning of troop?

noun

• A group of soldiers.
• A cavalry unit corresponding to an infantry company.
• A unit of Girl or Boy Scouts.
  • synonyms: scout troop, scout group
• An orderly crowd.
  • usage: "a troop of children"
  • synonyms: flock

verb

• March in a procession.
  • usage: "the veterans paraded down the street"
  • synonyms: parade, promenade
• Move or march as if in a crowd.
  • usage: "They children trooped into the room"