/ ˈbleɪzə(r); NAmE / noun
a jacket, not worn with matching trousers / pants, often showing the colours or badge of a club, school, team, etc.
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WORD ORIGIN
late 19th cent.: from blaze burn brightly + -er . The original general sense was a thing that blazes or shines (mid 17th cent.), giving rise to the term for a brightly coloured sporting jacket.