derrotabas
-you were defeating
The word derrotabas is the imperfect form of derrotar in the second person singular. There are other translations for this conjugation.
See the full derrotar conjugation

derrotar

Bueno, y quería ver que si lo derrotabas.
Well, and I wanted to watch you beat him.
Los derrotabas a los dos?
Both used to be defeated by you?
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