• Basic forms
• 乱れる — be disordered; be disturbed / base form
• 乱れます — become disordered / masu form
• 乱れた — became disordered / ta form
• 乱れて — becoming disordered … / te form
• 乱れない — do not become disordered / negative
• 乱れれば — if (something) becomes disordered / conditional
• Common expressions
• 心が乱れる — one’s mind is disturbed
• 服装が乱れる — clothing becomes untidy

乱れる（みだれる） is an ichidan intransitive verb. It describes a state becoming disordered or disturbed — physically, emotionally, or socially — without focusing on a cause.

• Basic forms
• 乱す — disturb; throw into disorder / base form
• 乱します — disturb / masu form
• 乱した — disturbed / ta form
• 乱して — disturbing … / te form
• 乱さない — do not disturb / negative
• 乱せば — if (someone) disturbs / conditional
• Common expressions
• 秩序を乱す — disrupt order
• 調和を乱す — disturb harmony

乱す（みだす） is a godan transitive verb. It means to actively cause disorder or disturbance — in order, rules, harmony, or another person’s state of mind.