créoliser

Créoliser means to creolize — used mainly reflexively (se créoliser) in linguistics and cultural studies to describe a language or culture blending and transforming through sustained contact between different groups, a concept especially associated with the work of Martinican writer Édouard Glissant.

• Le français s'est créolisé au contact d'autres langues aux Antilles. — French became creolized through contact with other languages in the Caribbean.
• Les linguistes étudient comment certaines langues se créolisent rapidement. — Linguists study how some languages creolize quickly.
• Sa pensée sur les cultures qui se créolisent a marqué les études postcoloniales. — His thinking on cultures that creolize shaped postcolonial studies.

Créoliser is academic vocabulary from linguistics and cultural theory, not a verb for everyday mixing or blending in general — using it loosely for, say, a recipe combining cuisines would stretch it well past its actual specialist meaning.