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backspace to move a typewriter carriage or computer cursor back one or more spaces by pressing a certain key. [2 definitions]
backspin a reverse spin put on a ball, such as a billiard or tennis ball, that causes it to stop suddenly or move in a backward direction.
backstage to or in the areas of a theater stage that are not visible to the audience, esp. the wings and dressing rooms. [4 definitions]
backstairs secret or underhanded; clandestine.
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]
backstreet a minor road somewhat distant from major thoroughfares within a town or city. [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]