This is a great term in spoken English. It’s also very easy to use and understand this.
If someone is “over the hill” it means they are “too old for something”. They are “past their prime”. They are past the best years of their lives or their career.
If someone is “over the hill” it means they are “too old for something”. They are “past their prime”. They are past the best years of their lives or their career.
I could say, “Michael Jordan was the best NBA basketball player in history, but he couldn’t play in the NBA now because he’s slow now and way over the hill“. I could also say, “Don’t listen to him. He was a smart man when he was young, but now he’s over the hill and makes no sense when he talks.”
So, “over the hill” means “too old to perform your best at something”.