"formalize" in German to formalize formalisieren Detailed translations for "formalize" to formalize to formalize(also: to formalise) formalisieren{transitive verb} But we're gonna have to formalize our business relationship on the long-term. Source: opensubtitles.org Corpus by OPUS Request review Aber wir werden... unsere Geschäftsbeziehung langfristig formalisieren müssen.