Sepultar means "to bury" or "to inter." It's a strong and somewhat dramatic verb that evokes a sense of finality and deep emotional action.
In the song, the lyric "Hace tiempo la fui a sepultar" (A long time ago I went to bury it) refers to burying hope. This metaphorical use of sepultar to describe the deliberate act of letting go of hope makes it a poignant and memorable word, highlighting the song's theme of disillusionment.
Enjambre open on a scene of pure magnetism: "Tu entrada parece triunfar, que todas las miradas van contigo" ("Your entrance seems to triumph, all eyes go with you"). That spell is what the rest of the song has to reckon with, because admiration curdles into regret. The singer admits "Yo fui un ingenuo al planear cuando íbamos a resultar" ("I was naive in planning when we were going to work out"), and settles on a harder truth: "Era imposible evitar tu hechizo" ("It was impossible to avoid your spell").
The hook makes the theme explicit: "Que la esperanza es lo que muere hasta el final" ("Hope is what dies in the end"). It's not a song about losing someone gently. It's about the moment you stop expecting things to work and admit it to yourself. That admission lands hardest in the closing lines, where any lingering hope is declared over: "Y la esperanza ya no está, hace tiempo la fui a sepultar" ("And hope is gone, some time ago I went and buried it").