When you have a «crush» at someone, what does it mean?

Question

When you have a «crush» at someone, what does it mean?

Answer 1

it means that you have feelings for them that they will never return.

your feelings get crushed - that is why they call it that.

Answer 2

For me it only means that you have an infatuation to that person.  In short, you admire that person.  

Answer 3

you find them really attractive in some way