—v.t. 1. to move quickly down and up: to bob the head. 2. to indicate with such a motion: to bob a greeting.
—v.i. 1. to make a jerky motion with the head or body.
2. to move about with jerky, usually rising and falling motions: The ball bobbed upon the waves. 3. bob up, to emerge or appear, esp. unexpectedly: A familiar face bobbed up in the crowd.
—n. 1. a style of short haircut for women and children.
2. a docked horse's tail.
3. a dangling or terminal object, as the weight on a pendulum or a plumb line.
4. a short, simple line in a verse or song, esp. a short refrain or coda.
5. Angling. a. a knot of worms, rags, etc., on a string.
b. a float for a fishing line.
6. a bobsled or bob skate.
7. Scot.a bunch, cluster, or wad, esp. a small bouquet of flowers.
8. Obs.See walking beam.
—v.t. to cut short; dock: They bobbed their hair to be in style.
—v.i. 1. to try to snatch floating or dangling objects with the teeth: to bob for apples. 2. Angling.to fish with a bob.