Alterasteis
Alterasteis is a verb form in the Spanish language. Specifically, it is the second-person plural preterite indicative of the verb "alterar." The preterite tense in Spanish is used to describe completed actions in the past. The second-person plural, "vosotros" (or "vosotras" for an all-female group), refers to the informal "you all" in Spain. Therefore, "alterasteis" translates to "you all altered" or "you all changed."
The verb "alterar" itself has several meanings, including to change, to modify, to disturb, or to upset.