moめるmeru
1.

To engage in a discussion characterized by differing opinions, leading to arguments or controversies.

2.

To experience a state of emotional disturbance or agitation due to conflicts or worries.

3.

To struggle with a sense of unease or annoyance, often resulting from unresolved issues or concerns.

4.

To incur additional expenses or face increased costs due to ongoing disputes or complications.

Example:

彼らは財産分けのことでもめている。