-you were eating
The word comíais is the imperfect form of comer in the second person plural.
See the full comer conjugation


¿Qué comíais cuando estabais en Australia?
What did you eat when you were in Australia?
No sé qué comíais.
I don't know what you ate
Abordó a la chica a la que os comíais con los ojos toda la noche.
She accosted the girl you were all ogling that evening.
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