Longman Dictionary of Contemporary English homepage

grandaddy

 noun
     
Related topics: Family
gran‧dad‧dy , granddaddy plural grandaddies [countable] American English informal
1SSF grandfather
2

the grandaddy of something

the first or greatest example of something:
Louis Armstrong, the grandaddy of all jazz trumpeters
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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