(chiefly US) The practice of openly carrying a firearm in public.

plural of open-side

Alternative form of eye-opener

(informal) To open (a bottle, can, etc. of drink, especially alcoholic drink), especially in order to celebrate; also extended to other packaged items. / (informal) To start reading (a book).

plural of open fire

plural of pew-opener

A business model for software whereby the core is open-source and free, while closed-source add-ons are available for purchase.

(computing, of software, hardware or a product) The quality of being open-source.

plural of open rectangle

plural of opening time