Real Dictionary

bob
verb: If something bobs, it moves up and down, like something does when it is floating on water.
verb: If you bob somewhere, you move there quickly so that you disappear from view or come into view.
verb: When you bob your head, you move it quickly up and down once, for example when you greet someone.

Bob in American English
Robert1: dim. Bobby
noun: a male given name, form of Robert

bob in American English 1
a hanging cluster
intransitive verb: to make a jerky motion with the head or body
noun: a short, jerky motion
transitive verb: to move quickly down and up

bob in American English 2
a shilling
noun: a style of short haircut for women and children

bob in American English 3
noun: a tap; light blow
transitive verb: to tap; strike lightly

bob in American English 4
noun: a shilling

Bob in British English
noun

bob in British English 1
noun: a short abrupt movement, as of the head
verb: to move or cause to move up and down repeatedly, as while floating in water

bob in British English 2
noun: a hairstyle for women and children in which the hair is cut short evenly all round the head
verb: to cut (the hair) in a bob

bob in British English 3
noun: a light knock; tap
verb: to tap or cause to tap or knock lightly (against)

bob in British English 4
noun