were clenching
-estuviste apretando
Past progressiveconjugation ofclench.There are other translations for this conjugation.

clench

I looked at the crowd that had gathered, most of whom were clenching their fists and cracking their knuckles, with livid expressions on their face, and some had even drawn their weapons.
Miré a la multitud que se había reunido, la mayoría de ellos apretaban sus puños y tronaban sus nudillos con expresiones lívidas en sus caras y algunos incluso habían sacado sus armas.
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