IPA: //ˈbleɪ.zər//
KK: /ˈbleɪzər/
A type of lightweight jacket that is often colorful or striped, usually worn in casual or semi-formal settings, and features pockets and a notched collar.
He wore a stylish blazer over his shirt for the dinner party.
Blazer originates from the word 'blaze' (from Old French *blaser*, meaning to shine or to glow) and the suffix '-er' (meaning a person who). The term originally referred to a person who wore a bright or striking jacket, often associated with sports or informal occasions.
Think of someone wearing a bright 'blaze' of color — that's why a 'blazer' is a type of striking jacket.