are toughening
Present progressive conjugation of toughen. There are other translations for this conjugation.

toughen

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500+ learners.
And today, right before pulling away, EU leaders are toughening their positions and planning to charge astronomical figures from Britain.
Y hoy, justo antes de retirarse, los líderes europeos están endureciendo sus posiciones y planes de hacer cargos exorbitantes a Gran Bretaña.
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