noun thing·um·bob \ˈthiŋəm(ə)ˌbäb\
variants: or



Definition of thingumbob



  1. :  something whose specific name or designation has been forgotten or is not known mysterious electrical thingumbobs that go off with a bang — Literary Review

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Origin and Etymology of thingumbob

irregular from thingum

First Known Use: 1751

Seen and Heard

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to cast off or become cast off

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