a cheap shot

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

golpe bajo, comentario injusto

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.
Su comentario sobre sus errores pasados fue un golpe bajo.
The politician took a cheap shot at his opponent's family.
El político lanzó un golpe bajo a la familia de su oponente.