雷声大，雨点小
léi shēng dà，yǔ diǎn xiǎo
基本释义
  1. 比喻做起事来声势造得很大，实际行动却很少。
出处
宋·释道原《景德传灯录》卷二十八:“雷声甚大，雨点全无。”
英文翻译
  1. his bite is worse than his bark
  2. action speaks louder than words
  3. loud thunder, but only tiny drops of rain (idiom)
  4. a lot of talk, but no action