To make something formal, official, or according to strict rules; the British spelling of formalize.
From 'formal' + suffix '-ize', with the British '-s' spelling convention. Developed in the 18th century alongside modern administrative and legal systems.
When you 'formalise' a friendship into a business partnership, you're adding structure—but sometimes that structure takes away the spontaneity that made the friendship special in the first place!
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