Arropar is a beautiful verb that literally means "to tuck in" or "to cover warmly with a blanket". It evokes a feeling of warmth, comfort, and safety.
In the song, Nelly Furtado sings, “Tú me arropas cada día” (You shelter me every day). Here, she uses it figuratively to describe how her partner's love provides her with emotional shelter and protection, making her feel cherished and secure.
This song is a beautiful description of a love so deep that two people feel like one. Nelly Furtado and Juan Luis Guerra sing about a connection that goes beyond a simple couple, describing their partner as "Carne de mi carne, huesos de mis huesos" (Flesh of my flesh, bones of my bones). This is a very serious way of saying they see the other person as a fundamental part of themselves, almost as if they were created from the same material.
The central idea is in the chorus: "Como lluvia en el agua fría" (Like rain on cold water). Think about it, when rain hits a lake, it just becomes part of the lake. You can't separate them anymore. That's how this love feels, a complete and natural merging. The song is full of these poetic and intimate images, like waking up to a "concierto / De tu cabello y el mío" (a concert / of your hair and mine), a lovely way to describe their hair tangled together in the morning.