near the knuckle
US /nɪr ðə ˈnʌkəl/
UK /nɪr ðə ˈnʌkəl/

1.
kurang sopan, tidak senonoh, agak lucah
almost offensive or rude, especially because of being sexual or involving rude humor
:
•
His jokes were a bit near the knuckle for the family gathering.
Jenakanya agak kurang sopan untuk perjumpaan keluarga.
•
The comedian's routine was quite near the knuckle, but the audience loved it.
Rutin pelawak itu agak kurang sopan, tetapi penonton menyukainya.