sus mejillas

his/her/their cheeks

→ su
phrase Rare #40,282
his/her/their cheeks Sus can refer to one person's cheeks or to multiple people's cheeks; the owner is clear from context.
SP: Sus mejillas se pusieron rojas con el frío.
EN: His cheeks turned red from the cold.

Desde que llegó el conde, sus mejillas tienen más color.

Since the count arrived, her cheeks have more color.

— La doncella (2016)

Sus mejillas estaban frías como el hielo.

Her cheeks were as cold as ice.

Caían lágrimas por sus mejillas.

Tears were falling down her cheeks.

Él leyó la carta, con lágrimas deslizándose por sus mejillas.

He read the letter, tears sliding down his cheeks.

Me miró con lágrimas cayendo sobre sus mejillas.

She looked at me with tears falling down her cheeks.

Sus mejillas estaban rojas.

Her cheeks were red.