もめる
もめる · momeru · JLPT N1 · verb-ichidan
to disagree
🥊 もめる = 揉める, from 揉む (to knead, to rub): two parties rubbing against each other until it turns into a fight
Think of two people's opinions grinding against each other like dough being kneaded. The verb 揉む means to knead or rub, so もめる is what happens when a disagreement keeps rubbing until it becomes a dispute.