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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Unknown; attested since the 1880s. Compare earlier daud (“a piece of something”), later doohickey (“a thing (whose name one cannot recall)”), dialectal dad, dadge (“a large piece, chunk”).
doohickey, doojigger, gimmick, gizmo, gismo, gubbins, thingamabob, thingumabob, thingmabob, thingamajig, thingumajig, thingmajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget
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Classic usage
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