off-limits

[ awf-lim-its, of- ]
/ ˈɔfˈlɪm ɪts, ˈɒf- /

adjective

forbidden to be patronized, frequented, used, etc., by certain persons: The tavern is off-limits to soldiers.

Origin of off-limits

An Americanism dating back to 1950–55

British Dictionary definitions for off limits

off limits

adjective (off-limits when prenominal)

not to be entered; out of bounds

adverb

in or into an area forbidden by regulations