consertar

From Portuguese <i>verb</i> To fix, to repair, to put right.
The related noun, "conserto", is often mixed up with concerto, the latter meaning "A musical composition for a solo instrument or instruments accompanied by an orchestra, esp. one conceived on a relatively large scale." (from Wiki)

Can you repair my car? <-> Você pode consertar meu carro?
They can't fix their own mistakes. <-> Eles não podem consertar seus próprios erros.
You must put this right! <-> Você tem que consertar isso!