Salto mortal literally translates to "deadly leap" and is also the term for a somersault. It's a dramatic phrase you won't hear in everyday conversation.
In the song, Shakira sings "Dimos un salto mortal" (We took a deadly leap), using it as a powerful metaphor. She's describing taking a huge, potentially disastrous risk in a relationship, a leap of faith into the unknown.
Colombian pop star Shakira teams up with Argentine rock legend Gustavo Cerati for "Día Especial", and right away, she drops all polite pretense: "No nos sirve más fingir" ("Pretending doesn't work for us anymore"). The song centers on that fragile, honest moment after a storm passes. She sings "Ya te perdoné / Adelanté las agujas del reloj" ("I already forgave you / I moved the clock hands forward"), deciding to push time ahead so the wounds stop hurting. Even though she knows trusting someone again can backfire, warning that "Sólo la ilusión trae desilusión" ("Only hope brings disappointment"), she takes the risk anyway.
The emotional peak comes when she describes their leap of faith as a "salto mortal" ("death-defying leap" or "somersault"). It sounds dramatic because it is; choosing to love someone who hurt you feels like jumping into the air without a safety net. But as the storm retreats ("Se aleja el temporal"), she spots "un faro en la oscuridad" ("a lighthouse in the dark"). Her heart keeps "latiendo como el sol" ("beating like the sun"), proving she is ready to treat today as a fresh start, no matter how bruised yesterday left her.