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Longman Dictionary of Contemporary English
old-school
adjective
EXAMPLES FROM CORPUS
▪ His was an old-school kind of guy.
▪ The report did not call for positive discrimination but suggested that male, old-school attitudes still prevailed in hospitals.
Douglas Harper's Etymology Dictionary
old-school

in reference to a group of people noted for conservative views or principles on some professional or political matter, 1749, from old + school (n.).

Wiktionary
old-school

a. (alternative form of old school English) n. (alternative form of old school English)

Usage examples of "old-school".

Many were old-school Arabists who abhorred the use of force against Iraq and generally disliked even the sanctions and inspections.

Then she hired an old-school terraformer -- little more than a plumber -- to add one of those achingly slow rivers and falls, popular on every low-gravity world in the Realm.

The result had been a radical de-emphasis of what the old-school types called "military polish"

The result had been a radical de-emphasis of what the old-school types called "military polish" and certain others called "Mickey Mouse" without knowing the term's origin.