Estocada literally means a "stab" or "thrust". It's most famously used to describe the final, fatal sword blow delivered by a matador in a bullfight.
In this song, Ricardo Arjona uses the phrase "dejando al tiempo la estocada a muerte" (leaving the death blow to time). He uses this incredibly powerful and dramatic metaphor to say that the relationship wasn't ended by a single event, but was left to slowly and inevitably die over time. It's a unique and poetic word that captures the tragic end of the love affair.
Ever been in a breakup where both people point fingers and refuse to take the blame? That is exactly what Guatemalan singer Ricardo Arjona and Gaby Moreno hash out in "Fuiste Tú" (It Was You). It plays out like a musical debate between two ex-lovers who remember the beginning as pure magic—kissing until they felt like they could touch the sky—only to end up exhausted, watching each other drive away down an empty road.
Arjona drops some beautifully blunt relationship truths here, like "O aprendes a querer la espina o no aceptes rosas" [Either you learn to love the thorn or don't accept roses]. He points out that love can hide its flaws early on by "Aceptando todo sin hacer preguntas" [Accepting everything without asking questions], letting time deliver the final blow. Moreno fires back from her own side, describing late-night walks barefoot under neon lights, trapped between who she actually is and who her partner wanted her to be. By the end, neither gives in: every verse crashes right back into that stubborn, shared accusation: "Fuiste tú" [It was you].