A place of punitive confinement; a lockup or cell; a military guardroom.

(transitive, Internet) To redirect (network traffic, etc.) nowhere; to discard (incoming traffic).

A smooth, barely visible, and dangerously slippery film of ice, usually over a dark surface, such as rock or pavement.

A member of the RIC British irregular army group, operating against Irish republicans in the War of Independence 1920/21.

(informal, aviation) A flight recorder; the brightly colored cockpit voice recorders and flight data recorders in an aircraft designed to aid in determining the cause of an accident.

(web development) To focus on the inputs and outputs without worrying about the internal complexity.

Alternative spelling of blackjack / Caranx lugubris, a gamefish / Bidens spp., from the family of Asteraceae / (obsolete) The larva of a turnip sawfly (Athalia rosae) / (mining, mineralogy) Sphalerite.

(countable) A light bulb that emits ultraviolet light, usually used to create the illusion that anything white is glowing. / (uncountable, slang) ultraviolet radiation/light

A cocktail containing vodka and a coffee-flavoured liqueur such as Kahlúa. / Used other than figuratively or idiomatically: see Black, Russian.

Pertaining to Black Russia. / Used other than figuratively or idiomatically: see Black, Russian.