床の上で

on the floor

→ 床
phrase Rare #34,143
on the floor Describes an action or state taking place on the floor. The particle で marks the location where something happens.
JA: 猫が床の上で寝ています。
EN: The cat is sleeping on the floor.

目が覚めてみると私は床の上で寝ていた

When I woke up, I found myself lying on the floor.

子供達は床の上で寝なければならないだろう

The children will probably have to sleep on the floor.

トムはまだ床の上で気を失っている

Tom is still unconscious on the floor.

床の上で食事できるほど

You’ve gotten to the point where you can even eat on the floor.

— ワン・バトル・アフター・アナザー (2025)

ここで床の上でもいい

Right here is fine, even on the floor.

— 暗殺の森 (1971)