estaban coreando
-they/you were chorusing
Imperfect progressive ellos/ellas/ustedes conjugation of corear.

corear

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Inclusive me dijeron que a la hora del almuerzo, los estudiantes estaban coreando: `¡Déjennos salir!' y `Libertad para Mumia', armando escán dalo.
I actually heard in the first lunch of the day all the students were chanting `Let Us Out! Let Us Out!' and `Free Mumia!' and going nuts.
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pacifier