the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war

The act or action of crossing, A place where anything (as a stream) is crossed; a paved walk across a street, or a set of marks across the street pavement indicating that this is a designated location for pedestrians to cross, a shallow area in a stream that can be forded, adjective_ rare Extending or lying across; in a crosswise direction

Any of various domesticated ruminant mammals of the genus Bos, including cows, steers, bulls, and oxen, often raised for meat and dairy products, a trench under a railroad track and alongside a crossing (as of a public highway) It is intended to prevent cattle from getting upon the track, noun_ Domesticated bovine animals (cows, bulls, steers etc), domesticated bovine animals as a group regardless of sex or age