Meaning: If something is old hat, it's old-fashioned and no longer seen as being modern and new.
- When I was a teenager in the 1980's punk and new-wave music was all the rage, but now it seems a bit old hat.
- Lots of technology that seems new and modern here is already old hat in places like Japan and South Korea.
Karen thinks my ideas on waiting until after you finish university before travelling overseas are really old hat. She says it's the sort of thing her