old hat
陈旧，过时，不再新鲜或有趣的事物
口语·形容过时或老套
英文释义
outdated or no longer interesting; something that is considered to be too familiar, common, or overused
例句
Wearing bell-bottoms is old hat now; nobody does it anymore.
典故来源
20世纪初，旧帽子象征过时，比喻事物不再流行或新鲜。