Definition of bob verb from the Oxford Advanced American Dictionary

     

    bob

     verb
    verb
    NAmE//bɑb//
     
    Verb Forms present simple I / you / we / they bob
     
    he / she / it bobs
     
    past simple bobbed
     
    -ing form bobbing
     
     
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  1. 1[intransitive, transitive] to move or make something move quickly up and down, especially in water bob up and down Tiny boats bobbed up and down in the harbor. bob something (up and down) She bobbed her head nervously. The maid bobbed a curtsy.
  2. 2[transitive] bob something to cut someone's hair so that it is the same length all the way around
  3. Phrasal Verbsbob up
See the Oxford Advanced Learner's Dictionary entry: bob