'Sombrou Dúvida' is a question. A play on words in Boogarins' native Brazilian Portuguese. It's a contraction of 'Sombra ou Dúvida', the title track of the album, which translates as 'Shadow Or Doubt'. This, the band's fourth studio album continues to elaborate on the dark themes of 2017's release 'Lá Vem a Morte'.