no-no
noun /ˈnəʊ nəʊ/
/ˈnəʊ nəʊ/
[singular] (informal)- a thing or a way of behaving that is not acceptable in a particular situation
不可做的事;不可接受的行为 - Earrings for men were once a definite no-no.
男人的耳环曾经是绝对不允许的。
- Earrings for men were once a definite no-no.