-they gather
The word fruncen is the present form of fruncir in the third person plural.
See the full fruncir conjugation


En realidad, aquí fruncen el ceño ante mi presencia.
Actually, they frown upon my presence here.
Como mucho, fruncen el ceño ante los temas de la campaña.
They follow the issues of the campaign with a raised eyebrow.
¿Qué quieres decir con que os besasteis? Bueno, ya sabes, Cuando 2 labios se fruncen, y ellos... No hace falta ser tan obvio, Stefan.
What do you mean, you kissed? Well, you know, When 2 lips pucker, and they— Don't be obvious, Stefan.
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