To become disordered or messed up (appearance, arrangement, order); to be disarranged or disheveled.
風が強くて髪が乱れる。
The wind is strong and my hair is getting messed up.
書類が散らかって机の上が乱れている。
The papers are scattered and the desk is a mess.
列の順番が乱れると入場が遅れてしまう。
If the order of the line gets disrupted, entry will be delayed.
To be upset, disturbed, or emotionally unsettled; to become confused or discomposed.
試験のことを考えると気持ちが乱れて集中できない。
When I think about the exam I get unsettled and can't concentrate.
彼の突然の一言で心が乱れた。
His sudden remark upset me.
大事な場面で感情が乱れて冷静に話せなかった。
My emotions got the better of me at an important moment and I couldn't speak calmly.
To lapse into chaos or disorder on a large scale (e.g., because of war or civil unrest).
内戦が起きて国の秩序が乱れた。
Civil war broke out and the country's order collapsed.
経済が不安定になると社会全体が乱れることがある。
When the economy becomes unstable, society as a whole can fall into disorder.