Use As A Phrase
One of many sports idioms, the phrase "slam dunk" is often used outside of basketball to refer colloquially to something that has a certain outcome or guaranteed success (a "sure thing").
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Famous quotes containing the word phrase:
“And what, then, is belief? It is the demi-cadence which closes a musical phrase in the symphony of our intellectual life.”
—Charles Sanders Peirce (1839–1914)