are toughening
Present progressiveconjugation oftoughen.There are other translations for this conjugation.

toughen

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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