罵ののしり合あう

expression, godan verb (-u)

insult each other; trade insults; verbally abuse each other

Describes two or more people exchanging insults or harsh words. The verb is intransitive and implies mutual action.

• 兄きょう弟だいが罵ののしり合あっているのを聞きいて、母ははが怒おこった。

  When she heard the siblings trading insults, their mother got angry.

• ネット上じょうで見み知しらぬ人ひと同どう士しが罵ののしり合あうのはよくあることだ。

  It's common for strangers to insult each other online.