The Collaborative International Dictionary of English v.0.48:
out-of-bounds \out-of-bounds\ adj. 1. (Sports) outside the delimited playing field. [Narrower terms: foul (vs. fair) ] WordNet 1.5] 2. barred to a designated group. [predicate] Syn: off-limits. [WordNet 1.5] 3. Beyond the limits of the expected standard of taste or propriety; as, an out-of-bounds remark. [PJC]WordNet (r) 3.0 (2006):
out-of-bounds adj 1: outside the foul lines 2: barred to a designated group; "that area is off-limits" [syn: {off-limits, out-of-bounds(p)]