Get ready, because gross has a few different meanings. When something is gross, it's disgusting. The noun, a gross, is the complete amount (before expenses), and the verb "to gross" is to bring in money.
Two things will tell you which meaning is the right one with a word like gross: the part of speech and the context. If you're talking about awful, sickening, vile things, you're looking at the adjective gross. If you're referring to, say, how much money a movie made, that's the noun gross; but remember, the gross is how much the movie made in total, not how much it cleared in profit after expenses (the net). As a noun, gross can also be a unit of measurement: if your teacher orders a gross of pencils, he'll get a shipment of 12 dozen. The verb to gross means to pull in money, as in: the bake sale grossed 30 dollar.