This is the 3620th most frequent Russian word.
спиной
"Спиной" means "with one's back" or "backward" in English.
The word 'спиной' denotes the physical part of the human body, referring to positioning relative to an object: 'with the back towards'.
Он стоял спиной к стене.
He was standing with his back against the wall.
Here, 'спиной' carries the meaning of the human back as a direction indicating respect or proper posture.
Здесь нельзя поворачивать спиной к сцене.
One should not turn their back to the stage here.
In this instance, 'спиной' is used to describe the part of the body experiencing a tactile sensation.