arruinasteis
-you ruined
The word arruinasteis is the preterite form of arruinar in the second person plural.
See the full arruinar conjugation

arruinar

Tú y tus colegas arruinasteis su vida.
You and your mates ruined his life.
Casi lo era, y lo arruinasteis.
I almost was, and then you ruined it.
Casi lo era, y lo arruinasteis.
I almost was, and then you ruined it.
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