It could be an infatuation or just a general interest. You don't even have to know the person to have a crush on someone. I had a crush on the girl from Boy Meets World, and she doesn't have a clue who I am...
Answer 1
Having a crush on someone is somewhat the same as falling in love. But having a crush is simply just admiring someone who "catches your attention".
Answer 2
Idiom: crush on someone
Infatuation with someone. (*Typically: get ~; have ~.)
"Mary thinks she's getting a crush on Bill."
"Sally says she'll never have a crush on anyone again."
http://idioms.thefreedictionary.com/crush
Scientists proved that infatuation is different from deep love.
It means you like them and you think they are special.
it means you have feelings for someone/ are attracted to them but you are you not fully in love with them.
it means you like somebody
It means someone has a crush on you and likes you.
it means you are thinking of your crush
Answer A first crush is the first time you have feelings for someone of the opposite sex.
You have had a crush on a person for a year and have not done anything about it.
Someone that you secretly admire. It'd be someone that you are attracted to, but don't tell them. If you had a secret crush/admirer, that means that there is someone that secretly fancies you.
having a crush on someone
It sounds like something other than a crush. If you had a crush on someone, you'd know exactly! who it was. There are lots of emotions it could be: perhaps anxiety or depression.
it might be he wants to know if you like someone or you might have a crush on him
"Crush" can mean " deform, pulverize, or force inwards by compressing forcefully" and "a brief but intense infatuation for (someone)."
no it's just ironic
youve been mean to them now they be mean to you
When someone looks at you a lot, it could mean they think you are pretty.