slam dunk

Noun
  1. Something that is a sure to occur;
    A foregone conclusion (synset 104764605)
    "predicting his success was a slam dunk"
    is a type of: certainty, foregone conclusion, sure thing - something that is certain
  2. A forceful dunk (synset 100111565)
    is a type of: dunk, dunk shot, stuff shot - a basketball shot in which the basketball is propelled downward into the basket

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