Retoñar literally means "to sprout again" or "to re-sprout," often referring to plants. It's a beautiful and somewhat uncommon verb in everyday conversation, making it stand out.
In this song, it's used metaphorically in the line "Deja retoñar nuestro fruto de amor" (Let our fruit of love sprout). It poetically refers to allowing a new life, a child, to grow and come into existence, emphasizing the natural and hopeful aspect of birth despite societal judgment.
Darío Gómez's "El Derecho De Nacer" tells a powerful story about love, social class, and the right to life. The song is from the perspective of a man deeply in love with a woman from a "buena familia" [good family]. He talks about how her family criticizes her because she fell in love with a poor man, seeing it as a "fracaso" [failure] and a "deshonra" [dishonor].
But the man doesn't care about their judgment, saying "En un verdadero amor no se distingue vanidad" [In true love, vanity is not distinguished]. He's committed to their love and their child, insisting "nuestro hijo tiene que nacer" [our child has to be born]. He challenges the idea that society's expectations should dictate their lives, especially when it comes to the right of their child to be born. It's a defiant and heartfelt declaration against social snobbery and for the power of genuine love.