Raggela comes from the verb raggelare, meaning to freeze or chill, often used to describe a sudden, intense cold.
In
Mina turns a possible breakup into an apocalypse. She opens with two commands rather than an argument: "Amore" ("Love") and "Abbracciamoci" ("Let's hug each other"), then "Perdoniamoci" ("Let's forgive ourselves"), before she explains why. "Perché sento un tuono profondo" ("Because I hear a deep thunder"). The refrain names the stakes directly: "È la fine del mondo" ("It's the end of the world"), "Se finisce l'amor" ("If love ends").
What follows isn't a metaphor so much as a body keeping score. The sun is still out, "Per me risplende il Sole" ("The Sun shines for me"), but "E non mi scalda il viso" ("And it doesn't warm my face"). The air she breathes turns cold, and "Il sangue si raggela nelle vene" ("The blood freezes in the veins"). The one line that sounds like comfort, "Tu tremi insieme a me" ("You tremble with me"), is really two people shaking at the same threat. When the refrain returns, "Se finisce l'amore" isn't a question anymore. It's a warning: hold on, or watch the world end with it.