Idiom be old hat Theme: FASHION to be old-fashioned; to be outmoded. (Informal.)That's a silly idea. It's old hat.Nobody does that anymore. That's just old hat.
idiombe old hatused in order to emphasize that something is not new or interesting:The Internet is already old hat to most academic researchers.Looking at the film twenty years later, a lot of the special effects seem like old hat, but the essential quality that made it popular then is still there.
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