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troop (n.)

1540s, "body of soldiers," 1540s, from French troupe, from Old French trope "band of people, company, troop, crowd" (13c.), a word of uncertain origin, perhaps from Frankish *throp "assembly, gathering of people" or another Germanic source, perhaps related to Old English ðorp, Old Norse thorp "village" (see thorp). OED derives the French word from Latin troppus "flock," which is of unknown origin but also might be from the proposed Germanic source. Of groups of animals from 1580s. Specifically as "a subdivision of a cavalry force" from 1580s; of Boy Scouts from 1908. Troops "armed forces" is from 1590s.

troop (v.)

1560s, "to assemble," from troop (n.). Meaning "to march" is recorded from 1590s; that of "to go in great numbers, to flock" is from c. 1600. Related: Trooped; trooping.

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Definitions of troop from WordNet
1
troop (n.)
a group of soldiers;
troop (n.)
a cavalry unit corresponding to an infantry company;
troop (n.)
a unit of Girl or Boy Scouts;
Synonyms: scout troop / scout group
troop (n.)
an orderly crowd;
a troop of children
Synonyms: flock
2
troop (v.)
march in a procession;
Synonyms: parade / promenade
troop (v.)
move or march as if in a crowd;
They children trooped into the room
From wordnet.princeton.edu