Princeton's WordNet

1. sideline, out of bounds(adj)

   a line that marks the side boundary of a playing field

2. out-of-bounds(adj)

   outside the foul lines

3. off-limits, out-of-bounds(p)(adj)

   barred to a designated group

   "that area is off-limits"

Wiktionary

1. out of bounds(Noun)

   A sideline marking the edge of a playing field or court.

2. out of bounds(Adverb)

   Outside the area of play; beyond the sideline of a playing field or court.

3. out of bounds(Adjective)

   prohibited to enter

4. out of bounds(Adjective)

   beyond the bounds of civility or morality; extremely unreasonable

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