1. verb To pay for some item or service before it is rendered. Don't front too much money for Richie's latest scheme—it's bound to fail, like all the others. I had to front the dealer $2,000 for my new car.

2. verb, slang To confront or accost someone. I wouldn't front those guys, they're dangerous!

3. verb, slang To act inauthentically; to put on a front. A: "Kelly's no party girl, so I don't know why she feels like she has to front." B: "Probably so those dumb sorority girls will like her."

4. noun Something reputable that hides underhanded or illegal activities. You know their restaurant is just a front, right? Those guys are really in the mob.

5. noun A manner of inauthentic behavior. You don't have to put up a front for me, I'm your best friend—you can tell me how you're really feeling.