double file

A double line, especially, a queue two persons wide.

Japanese Meaning

二列に並んだ行列、特に二人掛けの列（行列）

The students fell into a double file as they exited the auditorium.

生徒たちは講堂を出るときに二人並びの列になった。

Sense（1）

A double line, especially, a queue two persons wide.

The column marching in double file, the instructor commands: […]

double files

（ plural ）