Endulza is the third-person conjugation of the verb endulzar, which literally means "to sweeten". It comes from the word dulce (sweet).
In this iconic breakup anthem, Julieta Venegas sings about finding a new love "que endulza la sal" (that sweetens the salt). This beautiful and poetic phrase suggests a love so powerful it can turn the bitterness of tears or hardship into something sweet, making it a truly memorable and hopeful line.
Julieta Venegas's "Me Voy" is the ultimate song for when you've had enough. The singer is talking to a partner who just doesn't get her. She asks, "¿Por qué no tuviste el valor de ver quién soy?" (Why didn't you have the courage to see who I am?). She feels completely invisible, complaining that her partner only listens to the "ruido de afuera" (noise from outside) while she disappears beside them. So, she makes a decision. She's leaving.
What's so cool about this song is her attitude. She isn't going to sit around and cry. Instead, she says something really powerful: "No voy a llorar y decir / Que no merezco esto, porque / Es probable que / Lo merezco, pero no lo quiero" (I'm not going to cry and say / That I don't deserve this, because / It's probable that / I deserve it, but I don't want it). She's taking control. She knows something better is out there for her, someone who can give her a love "que endulza la sal y hace que salga el sol" (that sweetens salt and makes the sun come out). It's a shame, she says, but goodbye.