Acertijo translates to "riddle" or "puzzle". It's an intriguing word that adds a layer of mystery and depth to the lyrics.
In the song, the artist sings, "Yo soy ese acertijo en un libro maltratado" (I am that riddle in a worn-out book). This metaphor suggests a complex, perhaps misunderstood, individual who holds secrets or challenges to be solved, making the listener curious about the speaker's true nature.
"Si Nos Dejan" is a reggaeton love song about two people who feel like the world is always getting in their way. The singer describes life as a kind of prison, full of rules that keep him from being fully free with the person he loves.
The chorus imagines what would happen "if they let us" — flying off into space, traveling the world with no plan, spending whole days just loving each other without anyone watching or judging.
Between the verses, he praises his partner as his whole world, someone who understands him completely and keeps him steady no matter what other people say. It is a song about wanting an uncomplicated, unstoppable love in a world that keeps putting obstacles in the way.