To move up and down: a cork bobbing on the water. To grab at floating or hanging objects with the teeth: bobbed for apples. To fish with a bobber. To curtsy or bow. A quick, jerky movement of the head or body. A bobber used in fishing. A small, knoblike pendent object, such as a plumb bob. A small lock or curl of hair. A haircut that hangs evenly above the shoulders, often around the chin, worn especially by women or children. Informal Surgical shortening or reshaping of the nose. The docked tail of a horse. A bobsled. A bob skate.