Etymology

old school

Today it means: Preceded by the: a group of people characterized by being conservative or traditional; also, a method for accomplishing a task, a style, or a way of thinking that was employed in a former era, remembered either for its inferiority to the current method, or for its superiority over the new way. Full definition →

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The story

The noun is derived from old + school (“followers of a particular doctrine; particular doctrine or way of thinking”), probably a shortening of old school of thinking, old school of thought, or some similar phrase. The adjective is derived from the attributive form of the noun.

Etymology from Wiktionary, CC BY-SA 4.0.