estaban refunfuñando
-they/you were grumbling
Imperfect progressiveellos/ellas/ustedesconjugation ofrefunfuñar.

refunfuñar

Más aún cuando algunos animales ya estaban refunfuñando por su pobre liderazgo.
Moreover, some animals were already grumbling about his poor leadership.
Word of the Day
to cluck