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Related to trooping: Trooping the Colour
a. A group of soldiers.
b. troops Military units; soldiers.
c. A unit of cavalry, armored vehicles, or artillery in a European army, corresponding to a platoon in the US Army.
2. A unit of at least five Boy Scouts or Girl Scouts under the guidance of an adult leader.
3. A group or company of people, animals, or things.
intr.v. trooped, troop·ing, troops
To move or go as a group or in large numbers: The students trooped into the auditorium.
[French troupe, from Old French trope, probably from Vulgar Latin *troppu-.]
trooping the colour (= ceremony) → le salut au drapeau