陰かげ口ぐちを叩たたく

expression, godan verb (-ku)

backbite; speak ill of someone behind their back

Used for malicious gossip or criticism about someone who is not present. The phrase literally means 'to strike a shadow mouth'.

• 彼かれはいつも同どう僚りょうの陰かげ口ぐちを叩たたいている。

  He is always backbiting his colleagues.

• 陰かげ口ぐちを叩たたくのはやめなさい。

  Stop speaking ill of people behind their backs.