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thingamabob

noun [C]
 
 
/ˈθɪŋ.ə.mə.bɒb/ US  /-bɑːb/ (also thingamajig, UK also thingummy) informal

Definition

a word used, especially in spoken English, when the name of an object has been forgotten: I need one of those red thingamabobs for this - have you got one? → See also thingyNames and titles
(Definition of thingamabob noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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