below the belt

US /bɪˈloʊ ðə bɛlt/
UK /bɪˈloʊ ðə bɛlt/
"below the belt" picture
1.

卑劣な, 不公平な, 個人的な攻撃

unfair or cruel, especially in a way that is too personal

:
His comment about her past was really below the belt.
彼女の過去についての彼のコメントは本当に卑劣だった
That joke was a bit below the belt, don't you think?
その冗談は少し卑劣だったと思わない?