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:
“... that phrase of mischievous sophistry, “all men are born free and equal.” This false and futile axiom, which has done, is doing, and will do so much harm to this fine country ...”
—Frances Trollope (1780–1863)