slam dunk

Definitions of slam dunk
  1. noun
    a forceful dunk
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    type of:
    dunk, dunk shot, stuff shot
    a basketball shot in which the basketball is propelled downward into the basket
  2. noun
    something that is a sure to occur; a foregone conclusion
    “predicting his success was a slam dunk
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    type of:
    certainty, foregone conclusion, sure thing
    something that is certain
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