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 opening night

(Of an object) that opens, or is designed to open automatically, or opens of its own accord.

(chess) Synonym of Ruy Lopez