face up
Lo dejo boca arriba.
I leave it face up.
— Perfectos desconocidos (2016)
¿Estaba acostado boca arriba?
Was he lying on his back?
Estaba echado en la playa boca arriba.
He was lying on the beach, face up.
Estaba tumbado boca arriba en la cama.
He was lying face up on the bed.