gimmick

noun

1. 1

   any clever maneuver

   he would stoop to any device to win a point

   it was a great sales gimmick

2. 2

   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

3. 3

   a drawback or difficulty that is not readily evident

   it sounds good but what's the catch?