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:
“If this phrase of the “balance of power” is to be always an argument for war, the pretext for war will never be wanting, and peace can never be secure.”
—John Bright (1811–1889)