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single file

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noun [countable/uncountable] American English pronunciation: single file 
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singularsingle file
pluralsingle files
  1. a line of people or things in which one is directly behind the other
    in single file:

    Now, line up in single file to go to gym class.

derived word

single file

 American English pronunciation: single file  adverb

The three walked single file down the narrow corridor.

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