What is the meaning of bob?

noun

• A former monetary unit in Great Britain.
  • synonyms: British shilling, shilling
• A hair style for women and children; a short haircut all around.
• A long racing sled (for 2 or more people) with a steering mechanism.
  • synonyms: bobsled, bobsleigh
• A hanging weight, especially a metal ball on a string.
• A small float usually made of cork; attached to a fishing line.
  • synonyms: bobber, cork, bobfloat
• A short or shortened tail of certain animals.
  • synonyms: bobtail, dock
• A short abrupt inclination (as of the head. )
  • usage: "he gave me a short bob of acknowledgement"

verb

• Move up and down repeatedly.
  • usage: "her rucksack bobbed gently on her back"
• Ride a bobsled.
  • usage: "The boys bobbed down the hill screaming with pleasure"
  • synonyms: bobsled
• Remove or shorten the tail of an animal.
  • synonyms: dock, tail
• Make a curtsy; usually done only by girls and women; as a sign of respect.
  • usage: "She curtsied when she shook the Queen's hand"
  • synonyms: curtsy
• Cut hair in the style of a bob.
  • usage: "Bernice bobs her hair these days"