I'll try explain in english. First use: ficar = to stay, to remain: Ex: Fique aqui (= Stay here). Second use: the verb ficar can be used to make composite verbs (the verb ficar + the participle of other verb or an adjective). Ex: 1) Eu fiquei cansado = Eu me cansei (= I'd been tired); 2) Eu ficarei triste se ela não vier = Eu me entristecerei se ela não vier (= I'll be sad if she doesn't came). Third: ficar = date someone (a slang usual at Brasil). Ex. Eu já fiquei com aquela garota (= I've ever dated that girl).

hi .... the verb :ficar means :to stay .... if you want to learn portuguese i can help you....bye...

From my understanding Ficar means to remain/be left over....or to stay...or a general sense of to be there in conjunction with the other two meanings I wrote...I am no expert but this is the sense I got from my two portugues courses