Definitions

1. prep

at a position following the line of sight or direction of something

“The ball rolled behind the tree.”

2. noun

the back or rear part of something

“The car’s engine is located at the back, or behind, the driver’s seat.”

3. adv

at a point or time following a specified one

“He’s been working hard all day, but he’s still behind with his project.”

4. verb

to be in a position of being at the back or at a lower level than something

“The company is behind the times in terms of technology.”