Ensancha comes from the verb ensanchar, meaning 'to widen' or 'to expand'. It's a less common verb than 'abrir' (to open) or 'crecer' (to grow), making it more distinctive.
In the song, the lyric "Si es que al verte se me ensancha el corazón" (If it's that upon seeing you my heart widens) beautifully expresses a powerful emotional reaction. It paints a vivid picture of the heart swelling with love or joy, making it a memorable and evocative word choice.
Have you ever messed up so badly that it ruined everything, even though you know deep down it was just one mistake? That's exactly what Guaco's "Detalle en Falso" [A False Detail] is all about. The singer is heartbroken, trying to understand how their partner could think they don't love them, especially when seeing them makes their "corazón se me ensancha" [heart expand].
It's a really relatable feeling of regret and longing. Despite all the shared memories—"días de arena y campo" [days of sand and field] and "canciones que juntos cantamos" [songs we sang together]—one single "detalle en falso" [false detail] has left the night "en blanco" [blank]. The singer is stuck in a lonely, boring void, missing their partner's tenderness and voice, and just wants to "darle rienda suelta al corazón" [give free rein to the heart] but can't because they miss them so much. It's a powerful song about how one small error can have huge, devastating consequences on a relationship.