behind the door
She called him back to give him something he had left behind.
I'll do whatever I have to do to put Tom behind bars.
She left her bag behind on the rack when she got off the train.
When you hear hoofbeats behind you, don't expect to see a zebra.
This is like fighting someone with one arm tied behind your back.
I ran after him with a pile of papers that he'd left behind.
I passed behind him without being noticed.
He was way behind on his rent. As a result, he was evicted from his apartment.
Where’s the house? The house’s behind them.
After I shut the door, I remembered I had left my key behind.
Televisions with vacuum tubes are regarded as being behind the times.
I suppose that behind each thing we have to do, there's something we want to do...
Read the newspaper every day, or you will fall behind the times.
He went out for a walk, with his dog following behind.
2. in someone's wake
3. over the hill
Kathleen thinks she’s over the hill, but she’s only 32.
I’m not over the hill yet.
I would have thought Grandad was a bit over the hill to enter a dance contest!
If you say that someone is over the hill, you are saying rudely that they are old and no longer fit, attractive, or capable of doing useful work.
"Just remember, when you're over the hill, you begin to pick up speed."