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backstay a rope that extends from the mast to the stern or side of a vessel to help support the mast.
back-step a step taken backwards. [2 definitions]
backstop in sports, a structure, such as a fence or wall, used to keep a ball from going out of the playing area. [2 definitions]
backstretch the straight portion of a racetrack following the first turn. (Cf. homestretch.)
backstroke a stroke made with the back of the hand outward, as in tennis. [3 definitions]
backswept inclined or swept toward the rear.
backswing in sports, the first part of the swing of a bat, club, racket, or the like, in which it is swung toward the player's back in preparation for the forward swing.
back talk insolent replies or retorts; impudence.
back-talk (informal) to answer in an insolent manner.
back-to-back following immediately after another; in consecutive order. [2 definitions]
backtrack to retrace one's previous route. [2 definitions]
backup an alternate, substitute, or copy kept in reserve. [4 definitions]
back up to create and store a copy of (a computer file), often in a separate location, in case the original is damaged or lost.
backward in the direction of or to the rear or back. [8 definitions]
backward and forward in depth; completely; thoroughly.
backwash in nautical terminology, water that an oar, propeller, or the like pushes toward the rear of a boat. [4 definitions]
backwater a pool of water that a dam, current, flood, or the like prevents from flowing. [2 definitions]
backwoods (often used with a sing. verb) an area that is mostly covered with trees and that has few inhabitants. [4 definitions]
backyard an open area behind a house that is part of the homeowner's property.
bacon a fatty, smoked, and salted form of pork, taken from the back and side of the pig.
bacteria pl. of bacterium. Bacteria are one-celled microscopic organisms of various shapes that are often agents of fermentation and putrefaction and that, in some cases, cause disease.