1. Anything that hangs so as to play loosely, or with a short abrupt motion, as at the end of a string; a pendant; as, the bob at the end of a kite's tail. In jewels dressed and at each ear a bob. (Dryden)
2. A knot of worms, or of rags, on a string, used in angling, as for eels; formerly, a worm suitable for bait. Or yellow bobs, turned up before the plow, Are chiefest baits, with cork and lead enow. (Lauson)
7. (Science: engineering) a working beam.
11. A blow; a shake or jog; a rap, as with the fist.
13. A shilling.
Origin: An onomatopoetic word, expressing quick, jerky motion; oe. Bob bunch, bobben to strike, mock, deceive. Cf. Prov. Eng. Bob, n, a ball, an engine beam, bunch, blast, trick, taunt, scoff; as, a v, to dance, to courtesy, to disappoint, OF. Bober to mock.
2. To angle with a bob. See bob, 2 & 3. He ne'er had learned the art to bob For anything but eels. (Saxe) to bob at an apple, cherry, etc. To attempt to bite or seize with the mouth an apple, cherry, or other round fruit, while it is swinging from a string or floating in a tug of water.