single file

noun
a line of persons or things arranged one behind the other; Indian file.

Origin:
1660–70

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
single file
 
n
a line of persons, animals, or things ranged one behind the other, either stationary or moving

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Single file is always a great word to know.
So is interrobang. Does it mean:
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
Deer are herd animals and frequently travel in single file.
They rolled south toward the outpost, rattling through sleeping neighborhoods
  in single file, spaced well apart.
Not a single file on the detainees survives in the police records.
Slow down and form a single file in congested conditions, reduced visibility,
  and other hazardous conditions.
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