"it sounds good but what's the catch?"
"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"
"he would stoop to any device to win a point" "it was a great sales gimmick" "a cheap promotions gimmick for greedy businessmen"
Many comedians have their gimmicks, either as catch-phrase, theme-song, or bit of 'business'.
Refuse to buy all goods with attached gimmick offers.
牛津高階第八版
美國韋氏詞典
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維基百科 (自由的百科全書)