一列に並んで

line up in a single file

→ 1列
phrase Rare #34,077
line up in a single file The て-form of 並ぶ, used here as an instruction or request to form a line.
JA: 入口の前に一列に並んでください。
EN: Please line up in a single file in front of the entrance.

一列に並んで下さい。

Please line up in a single file.

一列に並んで。

Line up in a single file.

彼らは一列に並んで立っていた。

They were standing in a line.