廊下に

in the hallway; into the hallway

→ 廊下
phrase Rare #35,201
in the hallway; into the hallway 廊下 means “hallway,” and に marks the location where something exists or the destination of movement. The exact translation depends on the verb.
JA: 廊下に猫がいます。
EN: There is a cat in the hallway.

廊下に出て部屋を間違えたふりをして戻ってくるんだ

Go out into the hallway, pretend you went to the wrong room, and come back.

— 8 1/2 (1963)

廊下にがある

There is a box in the hallway.

廊下に先生がいた

There was a teacher in the hallway.

廊下に生徒がいて並んでいる

Students are lined up in the hallway.