A place or service that allows intravenous drug users to obtain new hypodermic needles at little or no cost, often in exchange for used ones.

plural of needle exchange

plural of ion exchange

plural of cookie exchange

(Canada, US) A party where each attendee brings cookies of one type that they have baked, and attendees take home one of each kind of cookie.

Alternative letter-case form of Columbian Exchange

(US) Synonym of bureau de change

(law, England & Wales, Northern Ireland) The act of exchanging contracts.

(law, England & Wales, Northern Ireland, idiomatic) To formally contract to purchase, sell or otherwise be party to a disposition of an estate in land; usually requiring the payment of a deposit by one of the parties.

The act of shooting at each other by antagonists armed with guns.