A makeup product, usually used by women to cover up dark eyebags or light acne. The reason it's called that, is beacuse it originally came from the word conceal, which means to hide something.
PERSON 1: ugh i hate my eyebags!!!
PERSON 2: i have some concealer, wanna borrow some?
It's a makeup product that women use, to cover up any blemishes or imperfections on their face. They squeeze the mixture out of a foundation tube and then either apply it with a brush, a beauty sponge or their finger.
PERSON 1: *gets foundation* heres a gift *gives to other person*
PERSON 2: omg, thank you!! i can finally hide that pimple and those whiteheads on my face..