behind their back
No debes hablar de la gente a sus espaldas.
You shouldn't talk about people behind their backs.
No quería que pensara que nos estábamos viendo a sus espaldas.
I didn't want her to think we were seeing each other behind her back.
— Control (2007)
Él siempre habla mal de su padre a sus espaldas.
He always talks badly about his father behind his back.
Se la hicieron, y le dieron un tiro a sus espaldas.
They set him up and shot him in the back.
— Cidade dos Homens (2007)
Tiene una gran responsabilidad a sus espaldas.
He has a great responsibility on his shoulders.
— La Caída (2004)
Es Cristo con una cruz llamada cáncer a sus espaldas.
It is Christ with a cross called cancer on his back.
— Vivir (1952)
Nunca hables mal de los demás a sus espaldas.
Never speak ill of others behind their backs.
Él no quería hacerlo a sus espaldas.
He didn't want to do it behind his back.
— Mike & Nick & Nick & Alice (2026)
A nadie le gusta que hablen mal de él a sus espaldas.
Nobody likes it when people talk badly about them behind their back.
Tom habló de María a sus espaldas.
Tom talked about Maria behind her back.