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English definition of “rhubarb”

rhubarb

exclamation     /ˈruː.bɑːb/ US  /-bɑːrb/
a word that is repeated many times in order to produce the sound of people talking when the meaning of the word is not important : We had to stand at the back of the stage saying "rhubarb, rhubarb" in the crowd scenes .Nonsense
(Definition of rhubarb exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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