O que não mata engorda - What doesn't kill you fattens you.
The Brazilian equivalent of "what doesn't kill you makes you stronger". Engordar literally means "to become fatter", or "to fatten".
(Pegar) dois coelhos com uma cajadada só - (To get) two rabbits with a single club
The Brazilian equivalent of "to get two birds with one stone". Except that instead of stoning birds to death one is clubbing rabbits to death instead.