A falling-out; a quarrel or estrangement—becoming on bad terms due to disagreement or misunderstanding.
小さな誤解から親友と仲違いしてしまった。
A small misunderstanding caused me to fall out with my close friend.
両家の意見が合わず、結局仲違いしてしまった。
The opinions of both families didn't match, and in the end they became estranged.
仲違いを避けるためには、早めに話し合うことが大切だ。
To avoid a falling-out, it's important to talk things through early.