Deterioró means “deteriorated” or “got worse,” describing something that gradually loses its strength or quality. In the song, it refers to the relationship falling apart over time: “desde ahí todo se deterioró” (“from there, everything deteriorated”).
It is a memorable, useful verb because it can describe relationships, health, buildings, or any situation that worsens little by little.
“Desde Cero” (“From the Beginning”) looks back at a love that started in childhood and refuses to accept that it has been forgotten. The narrator remembers being classmates, escaping lessons together, smoking in secret, living side by side, and feeling nervous the first time they became intimate. His proudest claim is repeated in the hook: “yo estuve desde cero” [I was there from the beginning]. In other words, he was there before success, distance, or a supposedly better life.
The story turns bitter when her family begins to reject him. He says they believed he was headed for trouble and sent her away so she would no longer be near him. Years later, she is living in California, married, and busy with a husband who works all the time. He looks at old school photos and notices that he appears in many of them, so the past suddenly returns. “Ni la distancia ni el tiempo podrán borrar lo nuestro” [Neither distance nor time will be able to erase what was ours] is his stubborn answer to the idea that she has moved on. The Spanish is direct and sometimes slangy: “tirar la mala” means to treat someone badly or speak against them, while “desde cero” means being present from the very start. It is a proud, jealous, slightly desperate love song from someone saying, “You can change your life, but you cannot rewrite who was there first.”