To make cold; to freeze or chill something.
From Latin 'frigor' (cold) plus '-fy' (from 'facere,' to make or do). A rare verb form from older English, now mostly replaced by 'freeze' or 'chill' in modern usage.
This verb is basically extinct—nobody says 'frigorify' anymore when 'freeze' works perfectly—but it shows how English used to pile Latin roots together to create action words!
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