slam dunk

1. 1.

   something that is a sure to occur; a foregone conclusion

   “predicting his success was a slam dunk”

   Broadercertainty
2. 2.

   a forceful dunk

   Broaderdunk

Questions about slam dunk

What does slam dunk mean?

slam dunk means "something that is a sure to occur; a foregone conclusion". That is the primary sense; the word has 2 in total, listed in full on this page.

Is slam dunk a common word?

slam dunk is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.