unjust enrichment

Noun

(law) a benefit gained at another's expense without legally justifiable grounds, such as one gained by mistake.

Japanese Meaning

不当利得：他者の費用（損失）を伴い、法律的に正当な根拠なしに得られた利益（例：誤って得た利益）

The plaintiff claimed unjust enrichment after the contractor retained the overpaid funds.

原告は請負業者が過払い金を保持したとして不当利得を主張した。

Sense（1）

(law) a benefit gained at another's expense without legally justifiable grounds, such as one gained by mistake.

unjust enrichments

（ plural ）