Juramos means "we swore" or "we promised under oath." It's a strong verb that implies a deep commitment and solemnity.
In the song, Quevedo sings, "De las cosas que un día juramos a oscuras" (Of the things we once swore in the dark). This word is interesting because it highlights the intensity of past promises made in secret, contrasting them with the changing reality of the present. It sets a reflective and somewhat melancholic tone for the song.
Quevedo's "Noria" is a really honest and a bit melancholic look at a relationship that's clearly on shaky ground. He starts by reminding his ex, "Acuérdate de las cosas que un día juramos a oscuras" [Remember the things we swore in the dark one day], emphasizing that promises made in the heat of the moment shouldn't change with the light of day. He admits to the constant back and forth, "Tantas idas y venidas que no sé si habrá una definitiva" [So many comings and goings that I don't know if there will be a definitive one], showing his uncertainty about their future.
What really hits you is how much this person changed him. He says, "Yo que era un bala perdi'a, ya dejé mi antigua vida solamente por conocerte" [I, who was a lost bullet, already left my old life just for knowing you]. It's a big declaration of how deeply he was affected. But things have clearly soured. He feels like she doesn't believe his promises anymore, and he's left feeling cold, even "ardiendo en llamas" [burning in flames]. He's looking out his window at her neighborhood, still holding onto a hope that what he feels isn't "ficticio o va ser real" [fictional or going to be real], but he's struggling to accept that "todo me va mal" [everything is going badly for me]. The song ends with him reflecting on the lack of closure, how he asked for an explanation but got nothing, and how he just has to accept things as they are.