Here's what it means depending on the context:
As a verb:
* "To carry" or "to wear"
* "Llevas una mochila" - You carry a backpack.
* "Llevas un vestido bonito" - You wear a pretty dress.
* "To have" or "to possess" (in the sense of something being with you)
* "Llevas tu teléfono contigo?" - Do you have your phone with you?
* "To take" or "to bring"
* "Llevas algo de comer?" - Are you bringing anything to eat?
As a noun:
* "Carries" or "takes" (referring to a person or object that carries things)
* "El autobús lleva muchos pasajeros" - The bus carries many passengers.
Note: The meaning of "llevas" will change slightly depending on the context and the rest of the sentence.