a disadvantageous point or circumstance, usually concealed or unnoticed: The tickets are free, but the kicker is that you have to wait in line for hours to get them.
b.
a surprising change or turn of events: The kicker was that their friends knew it before they did.
3.
something extra, as an additional cost or gain; an added expense or financial incentive.
4.
Draw Poker. a card, usually an ace or face card, held with a pair or three of a kind in the hope of drawing a matching card.
5.
(in concrete construction) a low plinth at the base of a column.
6.
kickers, Slang. shoes, esp. leisure shoes.
7.
Nautical.
a.
a small, low-powered outboard motor.
b.
an auxiliary engine on a sailing vessel, river steamer, etc.
8.
Slang. the alcoholic liquor in a mixed drink.
9.
Also called eyebrow, highline, overline, teaser.Printing,Journalism. a short line of copy set in a distinctive type above a headline and intended to call attention to it.
10.
Metallurgy. a charge of high-carbon iron that produces a vigorous boil when charged into an open-hearth furnace containing slag and molten metal of lower carbon content.
11.
Also called kicker light.Photography. a light source coming from the back and side of a subject and producing a highlight.
n. a clever but stinging remark; a sharp criticism; a zinger. : I waited for the kicker, and finally it came.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[oh-ver-lahyn] 
vərˌlaɪn