Used attributively (e.g., "crossing guard") to modify another noun.
Definitions
Relating to or designating a pedestrian crossing or similar place where something may cross. The council installed additional crossing lights near the school.
crossinggerund / present participle Used attributively to modify nouns (e.g., crossing guard, crossing gates)
Definitions
Serving to cross, intersect, or facilitate crossing. Crossing gates were installed at the busy railway junction.