The word crush is omnipresent in conversations among those under 25. For an adult, crush is a difficult mystery to grasp.
We can neither classify it in the category of love at first sight nor in that of flirtation. You can also have someone in your sights when you are really interested. But the crush is different because we are not necessarily going to talk to him and even less tell him. The term is a term of endearment for young people, but it is also a derogatory term for adults.