preposition
to the far side of (something), typically so as to be hidden by it:
the recording machinery was kept behind screens
the sun came out from behind a cloud
Underlying (something) but not apparent to the observer:
the agony behind his decision to retire
MORE EXAMPLE SENTENCES
2Following or further back than (another member of a moving group):
we were stuck behind a slow-moving tractor
MORE EXAMPLE SENTENCES
2.1At the back of (someone), after they have passed through a door:
she ran out of the room, slamming the door behind her
MORE EXAMPLE SENTENCES