Fall for (someone or something) hook, line and sinker verb phrase
To have strong feelings of love for someone or a strong interest in something that makes you unable to think in a sensible way
When I first saw that car, I fell for it hook, line, and sinker.
He falls for Lisa hook, line, and sinker.
To have an unquestioning belief in something untrue that someone tells you
I told them that I had lost my purse, and they fell for it hook, line, and sinker and gave me money.
The verb "fall" should be conjugated according to its tense.
This phrase is used to describe something very modern or updated or something that no longer looks like what it's used to.
It has been a long time since I left my high school, and now I have to admit that it's certainly not your father's high school anymore.