out-of-boundsadverb or adjective
Definition of out-of-bounds
: outside the prescribed or conventional boundaries or limits If the Frisbee hits the ground or soars out-of-bounds, it changes hands.— John Bowermaster Only a few yards over the green are out-of-bounds markers.— Jeff Gerth Our slate is going to have edgier films that aren't exactly out-of-bounds for children, but that are really made for more sophisticated audiences.— David Hochman
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