off-limits
adjectiveUK /ˌɒf ˈlɪmɪts/
US /ˌɔːf ˈlɪmɪts/
Not allowed to go into or use.
The kitchen is off-limits while the oven is hot.
RELATED WORDS
OTHER MEANINGS
2. Not to be discussed or touched on.
His personal life is off-limits in interviews.
3. Closed to the public or to certain people.
The construction site is off-limits to visitors.
4. Not available for use.
That parking spot is off-limits to students.