An obsolete or archaic term meaning to set on fire, to blaze up, or to make bright with flames.
From the prefix 'em-' (cause to be) combined with 'blaze,' derived from Old English 'blæse' meaning a bright flame or light. This word gradually became replaced by more common terms like 'set ablaze.'
Emblaze is one of those medieval words that makes you realize how many ways English had to describe fire before modern times—ember, flame, blaze, kindle, ignite—showing that fire was central to people's lives and speech.
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