be none of someone's business
US /bi nʌn əv ˈsʌm.wʌnz ˈbɪz.nɪs/
UK /bi nʌn əv ˈsʌm.wʌnz ˈbɪz.nɪs/

1.
不关某人的事, 与某人无关
to not be something that someone should be involved in or know about; to not concern someone
:
•
What I do in my free time is none of your business.
我空闲时做什么不关你的事。
•
Whether they get married or not is none of our business.
他们是否结婚不关我们的事。