V on to n, V onto n
The 'back' group
These verbs are concerned with indicating what is next to a building or room.
back front give lead open open out
We live in a ground floor flat which backs on to a busy street.
The front door, with security lock and spyhole, gives onto two corridors and a roomy hallway.
On the second floor, two shuttered French doors opened onto the balcony.
French windows open out onto the garden from the dining room.