Brújula translates to "compass", the navigational instrument.
In this song, the artist uses it in a powerful metaphor about feeling lost in a relationship. She sings, "Soy como una brújula; pierdo el norte si te abrazo" (I'm like a compass; I lose my north if I hug you).
This line cleverly plays on the Spanish idiom "perder el norte" (literally 'to lose the north'), which means to lose your way or your sense of judgment. It's a memorable and poetic way to express how a person can make you lose your sense of self.
This song is about that awful feeling when you realize a relationship is over, but you just can't bring yourself to leave. Chiara Oliver sings about a love that has turned into a constant fight, leaving behind nothing but "dos platos fríos en la mesa" (two cold plates on the table) after another argument. She feels trapped, remembering how happy she used to be and using that as a reason to stay, even though she admits it was "hace mucho tiempo, hace mucho" (a long time ago, a long time).
The whole song is built around a powerful metaphor: a relationship as a jigsaw puzzle. She asks, if "mis piezas no encajan en ti" (my pieces don't fit with you), then "¿Para qué seguir el puzle?" (Why continue the puzzle?). It's a heartbreaking and direct way to describe knowing you're no longer right for each other. She feels lost and small, singing that she's like a compass that loses its way when she gets close to her partner. It's a desperate plea for help to escape a love that no longer feels like love.