an ingenious or novel device, scheme, or stratagem, especially one designed to attract attention or increase appeal.
2.
a concealed, usually devious aspect or feature of something, as a plan or deal: An offer that good must have a gimmick in it somewhere.
3.
a hidden mechanical device by which a magician works a trick or a gambler controls a game of chance.
4.
Electronics Informal.a capacitor formed by intertwining two insulated wires.
verb (used with object)
5.
to equip or embellish with unnecessary features, especially in order to increase salability, acceptance, etc. (often followed by up ): to gimmick up a sports car with chrome and racing stripes.
1926 (in Maine & Grant's "Wise-Crack Dictionary," which defines it as "a device used for making a fair game crooked"), Amer.Eng., perhaps an alteration of gimcrack, or an anagram of magic.