in single file

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Related to in single file: in the first place, rub off, follow suit, catch up, the likes of, pat on the back

*in (a) single file

Fig. lined up, one behind the other; in a line, one person or one thing wide. (*Typically: be ~; get [into] ~; march ~; walk ~.) Have you ever seen ducks walking in single file? Please get into single file. Please march in single file.
See also: file, single
References in classic literature ?
Bulan was in the lead, and close behind him in single file lumbered his awkward crew.
In slow procession the things moved in single file along a grooved track.
Let us pretend to lie here among the sugar-cane and watch them as they steal by in single file, each with his hand on his dagger.
Good was leading, as the holder of the compass, which, being a sailor, of course he understood thoroughly, and we were toiling along in single file behind him, when suddenly we heard the sound of an exclamation, and he vanished.
The five millionaires of Devil's Ford had just turned the corner of the straggling street, and were approaching in single file.
Advancing in single file along the bank of the stream, we soon found that it narrowed down to a mere brook, and finally that it lost itself in a great green morass of sponge-like mosses, into which we sank up to our knees.