Use 'behind' to say that something is at the back of another thing. It shows a place that is further back or not in front.
The ball is behind the box.
She stands behind her friend.
'Behind' can mean you support or help an idea, person, or plan. It shows you are on their side.
She is behind the new plan.
Many people stand behind the team.
When you are 'behind' with work or tasks, you are late or not finished on time.
He is behind in his homework.
The project is behind schedule.
'Behind' can mean something is not open or clear. It can be secret or hidden and you need to find or understand it.
There is a reason behind her smile.
Look behind the door for clues.
When you are 'behind' someone in a competition, you are at a lower place or slower than them.
He is behind in the race.
She fell behind during the run.
Informally, 'behind' can mean the back part of the body that you sit on, also called the bottom or buttocks.
He fell and hurt his behind.
Sit down on your behind.
'Behind' can describe things that stay in a place after other things or people have gone.
The team left behind some equipment.
She left behind many memories.
