slam dunk

noun Basketball.
a particularly forceful, often dramatic dunk shot.

Origin:
1975–80

slam dunker, noun
Dictionary.com Unabridged

slam-dunk

[slam-duhngk]
verb (used with object)
Basketball. to dunk (the ball) with great force.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
slam dunk
 
n
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
 
vb
3.  basketball to jump up and force (a ball) through a basket

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Example sentences
There is no slam-dunk evidence that tyrannosaurs or other large predatory dinosaurs hunted in packs.
And some believe that anybody a given department recommends should be a slam-dunk.
Nutritionally, they're a slam-dunk, high in fiber and protein.
Their arguments are so pathetic, counterarguments based upon fact are a slam-dunk.
Synonyms
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