was furrowing
-estuve arrugando
Past progressiveconjugation offurrow.There are other translations for this conjugation.

furrow

I glanced at Roland again, and he was furrowing his brows as though he was trying very hard to understand what I was saying.
Volví a mirar a Roland y estaba frunciendo el ceño completamente concentrado como si le costara entender los que estaba diciendo.
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