fruncieron
-they gathered
The word fruncieron is the preterite form of fruncir in the third person plural.
See the full fruncir conjugation

fruncir

Los novios fruncieron los labios y se inclinaron para besarse.
The bride and groom puckered their lips and leaned in to kiss each other.
Alex y Katy hicieron las paces y sus labios se fruncieron en un beso.
Alex and Katy made up and their lips puckered in a kiss.
Los guardias fruncieron el ceño a su señor y dieron un paso al frente, pero un rápido y serio gesto de Turong les detuvo.
The guards frowned at their lord and took a step forward, but a quick, serious gesture from Turong halted them.
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