bob bob /ˈbɑːb/

noun

1. A short abrupt inclination (as of the head)  ( bob )
   a short abrupt inclination (as of the head)
    He gave me a short bob of acknowledgement
   he gave me a short bob of acknowledgement
   
2. A short or shortened tail of certain animals  ( bob , bobtail , dock )
   a short or shortened tail of certain animals
   
   
3. A small float usually made of cork; attached to a fishing line  ( bob , bobber , bobfloat , cork )
   a small float usually made of cork; attached to a fishing line
   
   
4. A hanging weight, especially a metal ball on a string  ( bob )
   a hanging weight, especially a metal ball on a string
   
5. A long racing sled (for 2 or more people) with a steering mechanism  ( bob , bobsled [ N. American] , bobsleigh [British] )
   a long racing sled (for 2 or more people) with a steering mechanism
    The Jamaican bobsleigh team competed in the Winter Olympics
   The Jamaican bobsleigh team competed in the Winter Olympics
   
   
6. A hair style for women and children; a short haircut all around  ( bob )
   a hair style for women and children; a short haircut all around
    She got a cute bob cut for the summer
   She got a cute bob cut for the summer
   
   
7. [Informal, UK] A former monetary unit in Great Britain  ( bob [Informal, UK] , British shilling , shilling )
   a former monetary unit in Great Britain
   
   

verb

1. () Move up and down repeatedly  ( bob )
   move up and down repeatedly
    Her rucksack bobbed gently on her back
   her rucksack bobbed gently on her back
   
2. Cut hair in the style of a bob  ( bob )
   cut hair in the style of a bob
    Bernice bobs her hair these days!
   Bernice bobs her hair these days!
   
3. Make a curtsy; usually done only by girls and women; as a sign of respect  ( bob , curtsy )
   make a curtsy; usually done only by girls and women; as a sign of respect
    She curtsied when she shook the Queen's hand
   She curtsied when she shook the Queen's hand
   
4. Remove or shorten the tail of an animal  ( bob , dock , tail )
   remove or shorten the tail of an animal
   
5. (sport) ride a bobsled  ( bob , bobsled [ N. American] )
   (sport) ride a bobsled
    The boys bobbed down the hill screaming with pleasure
   The boys bobbed down the hill screaming with pleasure