cross·ing / ˈkrôsing/ • n. 1. a place where two roads, two railroad lines, or a road and a railroad line cross. ∎ the action of moving across or over something. ∎ a journey across water in a ship. ∎ a place at which one may safely cross something, esp. a street. ∎ a place at which one can cross a border between countries. ∎ Archit. the intersection of a church nave and the transepts.2. crossbreeding.