law of unintended consequences

Noun

singular singular-only

An adage which proposes that every act has unintended consequences.

Japanese Meaning

意図しない結果の法則 / 予期せぬ結果に至る法則 / 計画には含めなかった結果の原則

When the city banned feeding pigeons, the law of unintended consequences led to an increase in rats.

市が鳩への餌やりを禁止したとき、意図せざる結果の法則によりネズミが増えた。

Sense（1）

An adage which proposes that every act has unintended consequences.

the law of unintended consequences

（ canonical ）