Granizo translates to "hail" in English. It's a less common word in song lyrics, making it stand out and pique curiosity.
In the song, the artist sings about
Ana Moura opens this one already gone: "Com a cabeça nas nuvens" [With my head in the clouds]. She's stuck replaying the same daydream, "Num jogo de faz de conta" [In a game of make-believe], waiting on someone who keeps not showing up.
Then the daydream turns physical. She imagines throwing herself out into the night to reach this person's window: "Então atiro-me ao espaço, desço pela luz da lua" [So I throw myself into space, I go down by the light of the moon], landing in an embrace, "Acordo-te num abraço, dou-me corpo e alma nua" [I wake you with an embrace, I give you my body and bare soul]. It's fado, so the ache is the whole point. This one just gives the ache somewhere to land.