The verb amarrar literally means "to tie up" or "to moor," like tying a boat to a dock. It's a strong, physical word that you wouldn't normally expect in a romantic ballad.
In "BESO", the singer uses this word in a beautifully poetic way, singing, "El cielo puedo amarrar" (I can tie up the sky). This powerful image expresses a willingness to do the impossible for love, even capturing the vast sky and giving it as a gift.
This song is a duet between ROSALÍA and Rauw Alejandro, and it's all about a love that's so intense, being apart feels like torture. They trade lines about how essential they are to each other, summing it up perfectly with: "Estar lejos de ti es el infierno / Estar cerca de ti es mi paz" (Being far from you is hell / Being near you is my peace). It's a song full of grand, poetic promises, like being able to bend time or tie up the sky for the other person.
But what makes it so special are the incredibly specific details. They don't just say they're in love; they describe what that love smells like: "Huele a tabaco y melón / Y a domingo en la ciudad" (It smells like tobacco and melon / And a Sunday in the city). They even include modern, relatable moments, like saying if their phone is about to die, the other person is the only one they'd tell. It’s a passionate declaration of a love that feels both epic and deeply personal.