out of bounds
adjective
°prohibited to enter.
"You can play wherever you want, but remember that the cemetery is out of bounds."
°beyond the bounds of civility or morality; extremely unreasonable.
"You were out of bounds to call him a criminal."
verb
°Outside the area of play; beyond the sideline of a playing field or court.
"The ball went out of bounds."
noun
°A sideline marking the edge of a playing field or court.
synonyms: off-limits