bilingualize
/(ˌ)bʌɪˈlɪŋɡw(ə)lʌɪz/(also bilingualise)
verb
1 [with object] Chiefly Canadian. To render bilingual; to require or encourage the use of two languages in (a place, institution, etc.).
2 [with object] To subject to the influence of two languages; to render in two languages.
Origin
1930s. From bilingual + -ize.