ㄌㄟˊléiㄕㄥshēngㄉㄚˋˇㄉㄧㄢˇdiǎnㄒㄧㄠˇxiǎo

  1. 聲勢行動五燈會元·○·禪師》:雷聲浩大雨點。』」比喻虛張聲勢金瓶梅·》:不幹昨日那等雷聲大雨點小打著上吊。」雷大雨小」。

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