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bob

verb
 
 
/bɒb/ US  /bɑːb/ (-bb-)

Definition

[I] to move up and down quickly and gently, especially on the surface of water: In the harbour, the boats bobbed gently up and down on the water.BouncingJumping [I usually + adv/prep, T] to move quickly in a particular direction: I dropped the bottle into the sea and watched it bob up to the surface a moment later. Suddenly a head bobbed up from behind the hedge. She bobbed a curtsy (= bent down from the knees briefly as a sign of respect) to the Queen.Moving quickly
(Definition of bob verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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