雷ㄌㄟˊ聲ㄕㄥ大ㄉㄚˋléishēngdà，雨ㄩˇ點ㄉㄧㄢˇ小ㄒㄧㄠˇyǔdiǎnxiǎo

简雷声大，雨点小

  1. 比喻聲勢大，行動少。例 「別看他大喊大叫，他行事向來雷聲大，雨點小」。

英loud thunder, but only tiny drops of rain (idiom)​; a lot of talk, but no action, action speaks louder than words, his bite is worse than his bark