Translation of unscrew in German

Arete means earring. Is it only in Mexico, regional? earring has multiple translations in Spanish, some are regionalism, others not. Arete, pendiente, caravana, and some others. But they are widely understood.
I've never been to America, but I wanna fly to New York in the end of this year, maybe go to Washington and possibly to LA. It would be nice one months to learn English there. I started to learn now.
Life in Brazil is exciting because it is so different. The people, the weather, and so much more! One can have a completely wrong impression when listening to the media. You can live a great life here.