dualiser

To make dual, or turn into a duality — a rare, mostly technical or academic verb; its reflexive form se dualiser is the more common variant, describing a group or institution splitting into two opposing camps.

• La société s'est dualisée entre partisans et opposants de la réforme. — Society split into two opposing camps over the reform.
• Certains linguistes cherchent à dualiser cette catégorie grammaticale. — Some linguists seek to turn this grammatical category into a dual one.
• Le marché du travail s'est dualisé entre emplois stables et précaires. — The labor market has split into stable and precarious jobs.

Mostly seen as se dualiser (reflexive, "to split into two opposing camps") in sociology and economics writing — the non-reflexive technical sense is rarer still and confined to specialized fields.