advocates or supporters of established custom or of conservatism:
a military man of the old school.
) a school formerly attended by a person
a group of people favouring traditional ideas or conservative practices
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
His way of dealing with people is strictly old school.]]>
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Dictionary of American Slang and Colloquial Expressions
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.