比喻毁坏信誉或名声to destroy one's reputation; to smash one's sign

• 麦当劳敢于冒天下之大不韪，拿砸牌子的风险来做赌注。

  McDonalds dares to go against popular opinion, gambling with the risk of destroying their reputation.

• 金字招牌，为什么使用的人毫不珍惜，偏偏要干砸牌子的事情呢？

  Why do people not take care of gilded reputations, but insist on doing things that destroy them?