Merriam-Webster's Collegiate® Dictionary, 11th Edition
BOB
I. verb (bobbed; bobbing)
Etymology: Middle English boben
Date: 13th century
transitive verb to strike with a quick light blow ; rap , to move up and down in a short quick movement , to polish with a bob ; buff , intransitive verb
1. to move up and down briefly or repeatedly , to emerge, arise, or appear suddenly or unexpectedly , to nod or curtsy briefly, to try to seize a suspended or floating object with the teeth ,
II. noun
Date: circa 1550
1. a short quick down-and-up motion, any of several folk dances, a blow or tap especially with the fist,
3. a modification of the order in change ringing, a method of change ringing using a bob, a small polishing wheel of solid felt or leather with rounded edges,
III. transitive verb (bobbed; bobbing)
Etymology: Middle English bobben, from Old French bober
Date: 14th century
deceive , cheat , to take by fraud ; filch ,
IV. noun
Etymology: Middle English bobbe
Date: 14th century
1. a. bunch , cluster , nosegay , a knob, knot, twist, or curl especially of ribbons, yarn, or hair, a short haircut on a woman or child, float 2a, a hanging ball or weight (as on a plumb line), trifle 1 ,
V. transitive verb (bobbed; bobbing)
Date: 1675
to cut shorter ; crop , to cut (hair) in the style of a bob, V
I. noun (plural bob)
Etymology: perhaps from the name Bob
Date: 1789
shilling , V
II. noun
Date: 1856
bobsled