below the belt
US /bɪˈloʊ ðə bɛlt/
UK /bɪˈloʊ ðə bɛlt/

1.
tidak adil, kejam, menyakitkan hati
unfair or cruel, especially in a way that is too personal
:
•
His comment about her past was really below the belt.
Komennya tentang masa lalunya benar-benar tidak adil.
•
That joke was a bit below the belt, don't you think?
Jenaka itu agak tidak adil, tidakkah anda fikir?