The word almorzasteis is the preterite form of almorzar in the second person plural.
See the full almorzar conjugation


Oye, Mads me dijo que almorzastéis en el club hoy, ¿verdad?
Hey, Mads told me you guys had lunch at the club today, is that right?
Want to Learn Spanish?
Spanish learning for everyone. For free.
SpanishDict Premium
Have you tried it yet? Here's what's included:
Cheat sheets
No ads
Learn offline on iOS
Fun phrasebooks
Learn Spanish faster
Support SpanishDict