decaísteis

Decaísteis is a word from the Spanish language. It is the second-person plural imperfect indicative form of the verb decaer. Decaer translates to meanings such as to decay, to decline, to fall, or to weaken. Therefore, "decaísteis" would specifically refer to the past action of "you all (plural, informal) decaying, declining, falling, or weakening."

The verb decaer is derived from the Latin word *decadere*, which also carries the meaning of falling or declining. In Spanish, decaer can be used in various contexts, including the literal decline of physical objects, the metaphorical decline of fortunes or spirits, or the weakening of political or social power.

The imperfect tense in Spanish, used here in "decaísteis," describes an ongoing or repeated action in the past, or a state of being in the past. Thus, "decaísteis" might be used to describe a situation where a group was in a state of decline over a period of time, or repeatedly experienced falls or weakenings. For example, one might say "Decaísteis en vuestra fuerza" meaning "You all were weakening in your strength." It is a verb form primarily used in Spain and is less common in Latin American Spanish, where the pronoun "vosotros" (you all, plural, informal) is not typically used, and other verb conjugations or phrasing might be preferred.