noun
EXAMPLES FROM CORPUS
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A narrow spiral staircase leads up from chamber 2b to 2c; characters must ascend in single file .
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Ambush patrols at night were always in single file , with no point or flank security.
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Men passed us, dark, bearded, stern, armed with sticks, walking swiftly in single file .
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Okay single file , we're coming to a wood.
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Teams of horses in single file hauled trains of a dozen flat-topped wagons loaded with granite along these rails.
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The jungle area we had to go into was so thick, the APCs could only travel single file .
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The stairs are approached along a raised pavement so narrow the people must have walked along it in single file .
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Then we are instructed to leave Damrosch Park single file .