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verb (used with object)
Basketball. to dunk (the ball) with great force.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slam dunk
1.  basketball a scoring shot in which a player jumps up and forces the ball down through the basket
2.  informal a task so easy that success in it is deemed a certainty
3.  basketball to jump up and force (a ball) through a basket

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Idioms & Phrases

slam dunk

A forceful, dramatic move, as in That indictment was a slam dunk if ever there was one. This expression is also often put as a verb, slam-dunk, meaning "make a forceful move against someone," as in This is a great chance for us to slam-dunk the opposition. The idiom comes from basketball, where it refers to a dramatic shot in which the ball is thrust into the basket from above the rim. It was transferred to other activities from about 1980 on.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
But even more important than the hominid bones was the slam dunk evidence for
  the ecological context the creature had inhabited.
Yeah, everyone says the second trilogy was a slam dunk.
Lasagnes of any kind are a slam dunk, a sure crowd-pleaser.
How you got involved in this whole thing was with the aim to slam dunk it.
Image for slam dunk
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