Definition of old hat in English:
Used to refer to something considered uninteresting, predictable, tritely familiar, or old-fashioned.
- So, you know what is - what is sort of banal and old hat to one group of people, is brand new to another group of people.
- I know it is old fashioned, and old hat, but Terry loves a good yarn.
- Suddenly native plants were thought dull, common and old hat; gardeners began to reject them, banishing them as weeds.