Supiera is a special form of the verb saber (to know) used for hypothetical situations, dreams, and regrets. It's the key to expressing all the 'what ifs' in Spanish, making it a powerful word for any learner to master.
In the song, Manuel Medrano sings the beautifully wistful line, "Si supiera darle al tiempo otro poco de tiempo" (If I knew how to give time a little more time). He uses supiera to express an impossible, heartfelt wish, making it a perfect word for adding a touch of poetry and deep emotion to your own Spanish.
Colombian artist Manuel Medrano kicks off this song by admitting he's in a bad place. He says, "Ya no puedo más / Llevo tres días sin soñar / Ya cuatro noches sin cantar" (I can't anymore / I've gone three days without dreaming / Four nights without singing). He's lonely and wondering if he can go back in time to a specific moment to be more honest and see what he missed. It's a song about that heavy feeling of regret, when you finally understand that someone made you incredibly happy, but only after they're gone.
The chorus is where he really lays it all out. He imagines traveling the entire planet just to find a perfect copy of his ex: "Si pudiera darle vueltas a la tierra una y otra vez / Yo buscaría de alguien con tus mismos ojos" (If I could go around the earth again and again / I would look for someone with your same eyes). Without her, he feels like his world has lost all its color and turned to black and white. He blames distance for making him blind to what he had, realizing all the moments he should have been there for her.