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off-limits (adj.)

"forbidden, outside the limits within which a particular group or person must remain," by 1881, U.S. military academies jargon, from off (prep.) + limit (n.). Earlier (1857) it was applied to cadets, etc., who were in violation of the limitations on their movement and behavior.

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Definitions of off-limits from WordNet

off-limits (adj.)
barred to a designated group;
that area is off-limits
Synonyms: out-of-bounds
From wordnet.princeton.edu