from behind
He attacked me from behind.
A nosotros también nos apuñalaron por la espalda.
We were stabbed in the back too.
Te sonríen y luego te apuñalan por la espalda.
They smile at you and then stab you in the back.
— Scary Movie (2000)
Asesinar por la espalda es de cobardes.
Killing from behind is cowardly.
Mátalo por la espalda, te resultará fácil.
Kill him from behind; you'll find it easy.
— Yojimbo. El mercenario (1961)
Debe haber sido apuñalado por la espalda cuando huía.
He must have been stabbed in the back as he was fleeing.
— Decision to Leave (2022)
No está bien criticar a la gente por la espalda.
It's not right to criticize people behind their backs.