a cheap shot

US /ə tʃiːp ʃɑt/
UK /ə tʃiːp ʃɑt/
"a cheap shot" picture
1.

卑鄙的攻擊, 不公平的言論

an unfair or unsporting remark or action, especially one made against a vulnerable person or at an opportune moment

:
His comment about her past mistakes was a cheap shot.
他對她過去錯誤的評論是卑鄙的攻擊
The politician took a cheap shot at his opponent's family.
這位政客對對手的家人進行了卑鄙的攻擊