Old Hat Definition
adjective
Old-fashioned; out-of-date.
Webster's New World
Behind the times; out of fashion.
Last year's styles are old hat.
American Heritage
Well-known or familiar to the point of being trite or commonplace.
Webster's New World
See old hat.
Wiktionary
noun
(idiomatic) Something with which one is very familiar; something very common, hackneyed or out of date. [from 20th c.]
Wiktionary
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