The word almorzaste is the preterite form of almorzar in the second person singular. There are other translations for this conjugation.
See the full almorzar conjugation

almorzar

Y almorzaste con un amigo de Hacienda la semana pasada.
And you had lunch with a friend from Treasury just last week.
El Juez se sintió ofendido cuando no almorzaste con él.
The judge was offended when you did not have lunch with him.
Tal vez comiste, pero no almorzaste.
Maybe you ate, but you didn't have lunch.
Ayer no almorzaste, y casi no cenaste.
Oh, no lunch yesterday, and hardly any supper last night.
Tú... espera, ¿almorzaste con mi esposo?
Wait, you had lunch with my husband?
Seth, si la reunión era tan importante, ¿por qué almorzaste conmigo?
Seth, if you knew the meeting was so important, why did you go to lunch?
Tú ni siquiera recuerdas qué almorzaste.
You don't remember what you ate for lunch.
¿Y no se te ocurrió mencionar eso cuando almorzaste la semana pasada?
And you didn't think to mention that when you were here for lunch last week?
¿Qué almorzaste hoy?
What did you have for lunch today?
Deberías saberlo, almorzaste conmigo.
You ought to know. You had it with me.
solo lo que vos almorzaste.
Just what you had for lunch.
¿Qué almorzaste hoy?
What did you eat for lunch today?
¿Por eso almorzaste conmigo el primer día?
Is He why you asked to sit with me at lunch the first day?
¿Qué almorzaste exactamente?
What did you have for lunch exactly?
¿No almorzaste con ella?
Didn't you lunch with her?
¿Qué almorzaste tú ayer?
What'd you have for lunch yesterday?
Cierto, almorzaste con él.
That's right; you had lunch with him.
¿Por qué no almorzaste?
Why didn't you eat lunch?
¿Qué almorzaste?
What did you eat for lunch?
¿Con quién almorzaste?
Who did you have lunch with?
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