bob2
  
  n.
    - a short hairstyle that hangs evenly all round.
 - a weight on a pendulum, plumb line, or kite tail.
 - a bobsleigh.
 - a short line at or towards the end of a stanza.
 
v.
 (bobs, bobbing, bobbed)
  - cut (hair) in a bob.
 - ride on a bobsleigh.
 
 
  Etymology
  ME (denoting a bunch or cluster): of unknown origin.
 
  
    
bob4
  
  n.
 a change of order in bell-ringing.
 
  Etymology
  C17: perh. connected with bob1.