gimmick
noun
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any clever maneuverdevice
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something unspecified whose name is either forgotten or not knowngizmogismowidgetdoodaddoohickeydoojiggergubbinsthingamabobthingumabobthingmabobthingamajigthingumajigthingmajigthingummywhatchamacallitwhatchamacallumwhatsis
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a drawback or difficulty that is not readily evidentcatch