Your person. The one you like not just because of looks But personality... You might like someone because they're popular on the outside, but you have to actuallly know them on the inside so go tell your your crush how you feel because you never know what they're going to say back...
Boy: Hey! You said you had to tell me something?
Girl: ..... Uhm yeah... I like you. A lot
Boy:.... Oh well I've been wanting to tell you that too.. You're my first Crush.
Someone that you are romantically attracted to, but you haven't made any move yet whatsoever, because of social awkwardness or other reasons.
Guy 1: -Hey, do you know that Jeff has a crush on Yvette?
Guy 2: -No, who told you that?
Guy 1: -He stared at her throughout all the chemistry lesson yesterday, and when she asked him to help with homework, he became completely red and people thought that he was choking.