käfta

Swedish

From käft (“jaw, mouth”) +‎ -a.

käfta (present käftar, preterite käftade, supine käftat, imperative käfta)

(colloquial) to bicker (argue in a nonproductive and somewhat heated way)
Synonyms: käbbla, smågräla

De käftar med varandra hela tiden. Jag tror deras förhållande spricker.
They're bickering all the time. I don't think their relationship will last.

Jag har inte tid att käfta med dig
I don't have time to argue with you
(colloquial) to mouth off (speak without discretion in a provoking manner)
Han ska alltid käfta när han dricker
He always starts mouthing off when he drinks

"To mouth" with a more animalistic word for mouth might provide intuition. See käft as well.