Decaíais
Decaíais is a Spanish verb form. It is the second-person plural imperfect indicative of the verb decaer. The verb decaer means to decline, decay, weaken, or fall. Therefore, "decaíais" translates to "you all were declining," "you all were decaying," "you all were weakening," or "you all were falling," depending on the context.
This verb form is used to describe an ongoing or habitual action in the past. For instance,
The subject of "decaíais" would be "vosotros" or "vosotras," the informal plural "you" in Spanish, primarily used