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Definition of slam dunk noun from the Oxford Advanced Learner's Dictionary

slam dunk

noun
 
/ˈslæm dʌŋk/
 
/ˈslæm dʌŋk/
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  1. (in basketball) the act of jumping up and putting the ball through the net with a lot of forceTopics Sports: ball and racket sportsc2
  2. (North American English, informal) something that is certain to be successful
    • Politically, this issue is a slam dunk for the party.
    • The movie is sure to be a slam-dunk hit.
    Topics Doubt, guessing and certaintyc2, Successc2
See slam dunk in the Oxford Advanced American Dictionary

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