molieron
-they ground
The word molieron is the preterite form of moler in the third person plural.
See the full moler conjugation

moler

A José lo molieron a golpes para que no nos dijera nada.
Jose's all beaten up so he won't tell us anything.
No, las botas de esquí que habían detrás volaron y molieron su cabeza.
No, the ski boots that was in the back flew up and chopped her head off.
Los altavoces se cortan entonces en un lado y los bordes de la abertura se molieron a mano.
The speakers are then cut on one side and the edges of the opening will be ground by hand.
Los panaderos molieron el maíz para hacer la tanta.
The bakers ground the corn to make the bread.
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