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backpack a pack used to carry objects, esp. camping gear, on one's back; knapsack. [3 definitions]
back-pedal to press backward on the pedals of a bicycle or tricycle in order to brake. [3 definitions]
backrest something against which one can rest one's back.
back road a country road, sometimes unpaved, that is away from the main highways.
backscatter the deflection, by electromagnetic or nuclear forces, of moving waves or particles away from their original direction at angles greater than ninety degrees.
backscattering backscatter.
back seat a seat behind other seats or in the back, esp. of a vehicle.
back-seat driver a passenger who gives unsolicited advice about driving to the driver.
backside (informal) the fleshy portion of the body upon which one sits; buttocks. [2 definitions]
backslide to revert to moral wrongdoing or sin.
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.