What does westbound mean?
Westbound describes travel or a direction that points toward the west. The adjective normally appears before a noun, as in "westbound traffic," while the adverbial use indicates movement in that direction, as in "the plane flew westbound." Although "west" and "bound" can seem equally important, "bound" here means directed or committed toward a destination, not tied or restrained. The word is especially common in transport and traffic reports, where it distinguishes vehicles moving in opposite directions on a road, rail line, or air route. It is used in everyday speech as well as formal signage and news writing in British and American English. The term also describes lanes, trains, flights, and other services organized according to their direction of travel. Its compound form makes the compass reference immediately visible while adding the practical sense of a route or heading. Westbound is thus both a plain directional description and a useful feature of transport vocabulary.
Traveling, facing, or directed toward the west.
"The westbound bus was approaching the terminal."
Most natural attributively before a noun, especially a vehicle, route, lane, or stream of traffic.
Toward or in the direction of the west.
"The ship changed course and proceeded westbound."
Westbound turns a compass point into a promise of direction: headed, destined, or moving toward the setting sun.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does westbound come from?
Westbound is an English compound of "west" and "bound." West descends from Old English "wester," while bound in the directional sense comes through the older use of the past participle of "bind," from Old English "bindan." The compound uses the sense "directed or destined toward" also found in expressions such as "bound for home," and it parallels compounds such as eastbound and northbound.
How westbound is actually used
The adjective form is especially common before nouns, particularly in transport and traffic contexts. In the adverbial use, "bound" means directed or destined toward a destination, not tied or restrained.
Easily confused with westbound
Westward primarily expresses the direction of movement, as in "travel westward," while westbound is especially conventional before transport nouns and traffic terms.
Western relates broadly to the west or a western region, whereas westbound specifically indicates travel or direction toward the west.