(UK) A system of bus operation where passengers may enter through various doors along the vehicle's length without having to pass the driver to buy or show a ticket.

Synonym of open-neck

simple past tense and past participle of open up

(video games) A gameworld that the player may traverse freely, rather than being restricted to certain predefined areas and quests.

plural of open world

plural of open-topper

Having an open top. / (of a vehicle) Having no roof, or having a top folded or detached.

(UK) A double-deck bus with an open, or partially open, top deck.

plural of door opener

The control mechanism by which a door is latched and unlatched. / Any of various devices to automatically open a door in response to a sensor or signal sent from a controller.