Definition of bob verb from the Oxford Advanced Learner's Dictionary

     

    bob

     verb
    verb
    BrE BrE//bɒb//
     
    ; NAmE NAmE//bɑːb//
     
    Verb Forms present simple I / you / we / they bob
    BrE BrE//bɒb//
     
    ; NAmE NAmE//bɑːb//
     
    he / she / it bobs
    BrE BrE//bɒbz//
     
    ; NAmE NAmE//bɑːbz//
     
    past simple bobbed
    BrE BrE//bɒbd//
     
    ; NAmE NAmE//bɑːbd//
     
    past participle bobbed
    BrE BrE//bɒbd//
     
    ; NAmE NAmE//bɑːbd//
     
    -ing form bobbing
    BrE BrE//ˈbɒbɪŋ//
     
    ; NAmE NAmE//ˈbɑːbɪŋ//
     
    Styling hair
     
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  1. 1[intransitive, transitive] to move or make something move quickly up and down, especially in water an old cigarette packet bobbing along in the current bob up and down Tiny boats bobbed up and down in the harbour. bob something (up and down) She bobbed her head nervously. The maid bobbed a curtsy.
  2. 2[transitive] bob something to cut somebody’s hair so that it is the same length all the way around More Like This Consonant-doubling verbs bob, club, dub, grab, rub, sob, throb kid, nod, pad, plod, prod, shred, skid, thud beg, blog, bug, drag, drug, flag, hug, jog, log, mug, nag, plug bar, confer, infer, occur, prefer, refer, star, stir, transfer acquit, admit, allot, chat, clot, commit, jut, knit, pat, regret, rot, spot, submit (in British English:) appal, cancel, channel, control, counsel, enrol, equal, excel, fuel, fulfil, label, level, marvel, model, pedal, quarrel, signal, travelSee worksheet. See related entries: Styling hair
  3. Word Originverb sense 1 late Middle English: of unknown origin. verb sense 2 late Middle English (denoting a bunch or cluster): of unknown origin. Phrasal Verbsbob up
See the Oxford Advanced American Dictionary entry: bob