single file

1. (uncountable, usually)A line or queue one person wide.

   They walked in a single file.

   Gänsemarsch

1. We walked down the narrow path in single file.

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2. The soldiers walked down the path in a single file.

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3. The children went upstairs in single file.

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4. The students walked in a single file.

   ruУченики шли гуськом.

   deDie Schüler gingen im Gänsemarsch.

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5. They walk in single file along the path.

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uncountable