be a slam dunk

be a slam dunk

To be predicted or expected to be successful; to be something that achieves success or a certain goal easily. All the best players in school are on our team—victory will be a slam dunk! I thought it would be a slam dunk to pass, but the bill didn't even make it out of committee.
See also: dunk, slam
Farlex Dictionary of Idioms.

be a ˈslam dunk

(American English) be something that is certain to be successful: The case looked like a slam dunk for the prosecution.
In basketball, a slam dunk is the act of jumping up and putting the ball through the net with a lot of force.
See also: dunk, slam
Farlex Partner Idioms Dictionary
See also:
  • dunk
  • slam
  • lightly
  • easy come, easy go
  • shoo-in
  • cut corners
  • cut corners, to
  • just (you) watch
  • watch!
  • be not for the faint-hearted