gimmick in WordNet English dictionary

1. a drawback or difficulty that is not readily evident
   "it sounds good but what's the catch?"
   catch  gimmick 
   
2. any clever maneuver
   "he would stoop to any device to win a point"; "it was a great sales gimmick"; "a cheap promotions gimmick for greedy businessmen"
   device  gimmick  twist 
   
3. something unspecified whose name is either forgotten or not known
   "she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use"
   doodad  doohickey  doojigger  gimmick  gizmo  gismo  gubbins  thingamabob  thingumabob  thingmabob  thingamajig  thingumajig  thingmajig  thingummy  whatchamacallit  whatchamacallum  whatsis  widget 
   

gimmick in English Wiktionary