Ocaso is a beautiful and poetic word for 'sunset' or 'twilight'. It's a more literary alternative to the common phrase puesta de sol.
In this deeply romantic song, Shakira lists all the things in the world she would let disappear, as long as her love remains. She sings that she wants to stay with her partner 'después del ocaso' (after the sunset), using the word to symbolize a love that endures through darkness and lasts forever.
Have you ever felt so in love that nothing else in the world matters? That's the entire mood of this song by Colombian superstar Shakira. She imagines a world where everything is falling apart, but she's fine with it as long as she has her one special person. She's willing to let go of everything, from the small annoyances of daily life to the biggest joys.
She sings about letting news channels get ruined and action movies end. But she goes much further, suggesting the world could lose all its pleasures, even poets: "que se muera hoy hasta el último poeta" (may even the last poet die today). It's all okay, as long as one thing remains: "Pero que me quedes tú / Y me quede tu abrazo" (But may you stay with me / And may your hug stay with me). For her, this person's love is all she needs to survive. As she puts it, "si me quedas tú / Me queda la vida" (if you stay with me / I have life).