Primaveras literally means "springs" or "springtimes." While "primavera" (spring) is a common word, its plural form primaveras is used here in a beautiful and poetic way that makes it stand out.
In the song, the lyric "Solo tú me haces sentir primaveras cualquier mes" (Only you make me feel springtimes any month) uses primaveras metaphorically. It conveys a feeling of constant renewal, joy, and blossoming love, as if every month feels as fresh and vibrant as spring, thanks to the person being sung about. This unique usage elevates a simple word into a powerful expression of profound affection.
"Sólo Tú" is Calibre 50 doing what they do best on a slow banda ballad: turning devotion into a list of superlatives. The hook keeps circling back to one claim, "Solo tú me haces sentir lo que realmente es amor" ("Only you make me feel what love really is"), and the verses build the case for it — "Conviertes lo imposible en realidad" ("You turn the impossible into reality"), "Te estaba amando incluso antes de nacer" ("I was loving you even before being born").
The lyric doesn't reach for metaphor so much as repetition — "Tú eres todo, todo" ("You are everything, everything") — which is the point: this is a love that needs no exaggeration, just the plain fact of it stated twice.