English

Adjective

off the reservation ‎(comparative more off the reservation, superlative most off the reservation)^[1]

1. (idiomatic) Violating rules or decorum.

Adverb

off the reservation ‎(comparative more off the reservation, superlative most off the reservation)

1. (idiomatic) In violation of rules; out of bounds.

References

1. ↑ Should Saying Someone Is 'Off The Reservation' Be Off-Limits?