noun
a line of people or things moving one behind the other
adjective
arranged one behind the other in a line
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The students were instructed to walk in single file while on the field trip.
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Hey guys, let's walk in single file so we don't take up the whole sidewalk.
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We had to line up single file like a bunch of ducks following their mother.
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The team moved through the narrow passage single file, resembling a snake slithering through the grass.