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.
Act in a way that is likely to cause problems for you
If you wear high heels for a long walk you're asking for trouble.