WordNet sense 1 (a former monetary unit in Great Britain):

shilling, British shilling

WordNet sense 2 (a long racing sled (for 2 or more people) with a steering mechanism):

bobsled, bobsleigh

WordNet sense 3 (a small float usually made of cork; attached to a fishing line):

cork, bobber, bobfloat

WordNet sense 4 (a short or shortened tail of certain animals):

bobtail, dock

WordNet sense 5 (remove or shorten the tail of an animal):

tail

WordNet sense 6 (make a curtsy; usually done only by girls and women; as a sign of respect):

curtsy