Where does “golden slam” come from?

golden slam (English) comes from English Golden, from Middle English golden, from Middle English gulden, from Dutch gulden, from Middle Dutch guldijn, from Old Dutch guldīn, from Proto-Germanic gulþīnaz, from Proto-Germanic gulþą — to flourish; green, yellow.

golden slam (English): The feat of winning all four major championships (a grand slam) plus an Olympic gold medal

Definitions

  1. The feat of winning all four major championships (a grand slam) plus an Olympic gold medal

Ancestry of “golden slam”, step by step

golden slam traces back through two separate lines of ancestry.

via English Golden

StepLanguageWordMeaning
1EnglishGoldenOS grid ref SW9246
2Middle EnglishgoldenFormed from gold; Decorated or covered with gold;...
3Middle EnglishguldenAlternative form of gilden
4Dutchguldengolden, made of gold; precious, excellent,...
5Middle Dutchguldijn
6Old Dutchguldīngolden
7Proto-Germanicgulþīnazgolden, made of gold
8Proto-Germanicgulþągold
9Proto-Indo-Europeanǵʰl̥tómgold
10Proto-Indo-Europeanǵʰelh₃-to flourish; green, yellow

via English Grand Slam

StepLanguageWordMeaning
1EnglishGrand Slamwinning in each of the three UEFA cups - UEFA Champions League, UEFA Europa League and Cup Winners' Cup (defunct)
Every word from Proto-Indo-European ǵʰelh₃-