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troop across (something or some place)
To move or march from one side of something or some place to another as a group or in large numbers. The students trooped across the field on their way to the trailhead. We watched the herd of elephants troop across the savanna
troop in(to something or some place)
To move or march in(to something or some place) as a group or in large numbers. The students trooped into the auditorium for the presentation. There were still a number of people trooping in when the performance began.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
troop across someone or something
[for a mass of creatures] to move across someone or something. The huge herds of wildebeest began to troop across the plain in search of food. The ants trooped across Karen as she lay in the sand.
troop in(to something)
to flock or march into something or some place in numbers. The scouts trooped into the mess hall and sat down. They trooped in and sat down.
See also: troop
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.