Blazing

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Old English blæse ‘torch, bright fire’, of Germanic origin; related ultimately to blaze2.

etymonline

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blazing (adj.)

late 14c., "shining," also "vehement," present-participle adjective from blaze (v.1). As a mild or euphemistic epithet, attested from 1888 (no doubt suggesting damned and connected with the blazes, the euphemism for "Hell").