雷ㄌㄟˊléi聲ㄕㄥshēng大ㄉㄚˋdà，雨ㄩˇyǔ點ㄉㄧㄢˇdiǎn小ㄒㄧㄠˇxiǎo

  1. 聲勢甚大，行動很少。語本《五燈會元·卷二○·鼓山安永禪師》：「師曰：『雷聲浩大，雨點全無。』」比喻虛張聲勢。《金瓶梅·第二○回》：「你既不幹，昨日那等雷聲大雨點小，要打著教他上吊。」也作「雷大雨小」。

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