give him enough rope and he'll hang himself

Proverb

If one gives someone enough freedom of action, they may destroy themselves by foolish actions.

Japanese Meaning

十分な自由（または自主性）を与えると、その人自身の愚かな行動が最終的に破滅を招く結果になること。 / 人に過剰な自由を許すと、本人が自らの欠点や過ちによって自滅する可能性があることを示す諺。

I won't intervene this time — give him enough rope and he'll hang himself.

彼に十分な自由を与えれば、自分の愚かな行動で自滅してしまうだろう。

Sense（1）

If one gives someone enough freedom of action, they may destroy themselves by foolish actions.