(bob) noun
1. In fishing, a cork or float on a line; a set or gang of fish hooks; a grapple.
2. A large, ball-shaped bait for eels, catfish, etc., made by stringing angleworms, rags, etc.
3. A grub or worm used for bait.
4. A small, pendent object, as on a pendulum.
5. A jerky bow or curtsy; any short, jerky movement.
6. A style of haircut for women or children cut short to fall about the ears.
7. The docked tail of a horse.
8. sing. & plural Brit. Colloq. A shilling.
9. Scot. A bunch; cluster; nosegay,
10. A short, stout sleigh-runner; also, a bobsled.
11. The refrain of a song.
—v. bobbed, bob·bing v.t.
1. To move up and down: to bob the head.
2. To effect by moving up and down: to bob a curtsy.
3. To cut short, as hair.
—v.i.
4. To move up and down with an irregular motion.
5. To curtsy.
6. To fish (for eels) with a bob.
—to bob up To appear or emerge suddenly. [ME bobbe a hanging cluster; origin uncertain]
—bob′ber noun

(bob) v.t. bobbed, bob·bing
To strike lightly and quickly; tap.
—noun Obs. A rap or blow; a shake or jog. [ME bobben; origin unknown]

(bob) v.t. Obs.
1. To mock.
2. To delude; cheat.
—noun A trick; also, a jeer or taunt; jibe. [OF bober]

(bob), Bob·by (bob′ē)
Diminutives of ROBERT.