off limits

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++off limitsnFORBID a) beyond the area where someone is allowed to go That area of beach was off limits to us ‘city kids’. b) beyond what you are allowed to do or have His private life is off limits to the press. → limit

Examples from the Corpus

off limits• The basement was always off limits to us kids.• Nearly one-quarter of the land will be completely off limits to development.• Social Security, 25 percent of all spending for other than interest on the debt, has been declared off limits.• Rumour has it that these are children with learning difficulties; off limits to our group of visiting helpers.• Consequently there is no topic that is off limits for discussion, even if a few are off limits for experimentation.• People's reaction to loss remains one of society's least understood and most off limits topics for discussion.• However; it was off limits for Robbie to hit or scratch his sister.• Unlike most group discussions, nothing was off limits.ˌoff ˈlimits adjective  be off limits a) if a place is off limits, you are not allowed to go there 禁止入内 SYN out of boundsbe off limits to/for Footpaths are, of course, off limits to bikers. 人行道当然不允许骑车。 b) if a subject is off limits, you are not allowed to talk about it 禁止谈论 Unlike most group discussions, nothing was off limits. 话题没有限制，这和大多数小组讨论不一样。

off limitsˌoff ˈlimits adjectiveLDOCE OnlineChineseSyllable  

beyond where area Corpus someone is allowed to the go

off limits

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++off limits  → off limits at limit1(1)

off limits  

off limits
ˌoff ˈlimits adjective
be off limits
  a. if a place is off limits, you are not allowed to go there
   SYN  out of bounds
    be off limits to/for
    Footpaths are, of course, off limits to bikers.
  b. if a subject is off limits, you are not allowed to talk about it:
    Unlike most group discussions, nothing was off limits.