Daría translates to "I would give". It is the conditional form of the verb dar (to give), which is used to talk about hypothetical situations or possibilities.
In this classic ballad, Julio Iglesias sings the heartbreaking rhetorical question, “¿qué no daría?” (what wouldn't I give?). He uses this powerful phrase to express profound regret and the desperate wish to undo his past mistakes and win back his lost love. It perfectly captures the song's melancholic theme of longing to "volver a empezar" (start over).
Spanish crooner Julio Iglesias takes on the classic dance rhythm with "Volver A Empezar", and right from the start, he sets the scene in English: "When they begin the beguine". A beguine is a slow, sensual ballroom dance from the French Caribbean. The minute that rhythm kicks up, the memories hit him. He is desperate to turn back the clock, singing "Quiero sentir las cosas de siempre" ("I want to feel the usual things") and pleading to find out if she still cares with "Quiero saber si tú aún me quieres" ("I want to know if you still love me"). It is a full confession of regret, all kicked off by hearing a specific melody.
Julio is completely blunt about why he ended up in this mess. He admits, "Yo que siempre jugué con tu amor hasta el final" ("I, who always played with your love until the end"). He was so cocky that he assumed she would never walk away: "seguro yo estaba que tú aún me querías" ("I was sure that you still loved me"). The Spanish phrase "qué no daría" literally translates to "what wouldn't I give," which is his way of saying he would sacrifice anything to wipe the slate clean. Now that he is completely on his own ("tan solo sin ti"), he realizes taking someone for granted has a steep price.