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:
“Those who marry God can become domesticated too—it’s just as hum-drum a marriage as all the others. The word “Love” means a formal touch of the lips as in the ceremony of the Mass, and “Ave Maria” like “dearest” is a phrase to open a letter.”
—Graham Greene (1904–1991)