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

1.
на грани фола, неприличный, оскорбительный
almost offensive or rude, especially because of being sexual or involving rude humor
:
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His jokes were a bit near the knuckle for the family gathering.
Его шутки были немного на грани фола для семейного сбора.
•
The comedian's routine was quite near the knuckle, but the audience loved it.
Выступление комика было довольно на грани фола, но зрителям понравилось.