thingumbob

noun

thing·​um·​bob

variants or thingumabob

ˈthiŋəm(ə)ˌbäb

plural -s

: something whose specific name or designation has been forgotten or is not known

mysterious electrical thingumbobs that go off with a bang

—Literary Review

Word History

Etymology

irregular from thingum

First Known Use

1751, in the meaning defined above

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