Pronunciation: /ˈsɪŋɡəl faɪl/
noun a line of people or things moving one behind the other
A1 The children walked in single file on the nature trail.
A2 Please line up in single file to board the bus.
B1 The hikers followed the guide in single file through the narrow canyon.
B2 The soldiers marched in single file towards the enemy's camp.
C1 The students were instructed to walk in single file during the fire drill.
C2 The prisoners were escorted out of the courtroom in single file by the guards.
adjective arranged one behind the other in a line
A1 The students walked in single file to the cafeteria.
A2 The hikers followed the trail in single file.
B1 The soldiers marched in single file during the parade.
B2 The participants lined up in single file for the race.
C1 The guests entered the banquet hall in single file.
C2 The prisoners were escorted out of the courtroom in single file.
formal The students were instructed to walk in single file while on the field trip.
informal Hey guys, let's walk in single file so we don't take up the whole sidewalk.
slang We had to line up single file like a bunch of ducks following their mother.
figurative The team moved through the narrow passage single file, resembling a snake slithering through the grass.
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