four corners
Refers to the four corners of a space, such as a room, garden, or sumo ring. Less common than the crossroads sense.
I decorated the four corners of the room with flowers.
crossroads; intersection; street corner
The most common meaning: a place where two streets cross, or a corner formed by intersecting streets.
Please turn right at that intersection.
There is a police box at the crossroads.
Please turn right at the intersection in front of the station.
If you turn left at the next intersection, you'll find the post office.
She always waits at the street corner.