Definitions
1.noun(collective) A collection of people; a number; a multitude (in general).
2.nounA small unit of cavalry or armour commanded by a captain, corresponding to a platoon or company of infantry.
3.nounA detachment of soldiers or police, especially horse artillery, armour, or state troopers.
4.nounSoldiers, military forces (usually "troops").
5.nounA company of stageplayers; a troupe.
6.nounA basic unit of girl or boy scouts, consisting of 6 to 10 youngsters.
7.noun(collective) A group of baboons.
8.nounA particular roll of the drum; a quick march.
9.nounMushrooms that are in a close group but not close enough to be called a cluster.
10.verbTo move in numbers; to come or gather in crowds or troops.
11.verbTo march on; to go forward in haste.
12.verbTo move or march as if in a crowd."The children trooped into the room."