What is "foul vs fair"

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.

3. Beyond the limits of the expected standard of taste or propriety; as, an out-of-bounds remark.