granddaddy

Noun

granddaddy (plural granddaddies)

1. (informal) A grandfather.

   Synonyms:

   gramps, pops

2. (informal) Something that is the greatest or most significant of its kind.
   • The nature of this gas enables it to absorb the majority of the sun's ultraviolet rays, thus saving the human race from the granddaddy of all sunburns.1957 December, All Hands, numbers 480-491, page 24
   • In the far corner, representing the twentieth century, is the granddaddy of all common stocks, AT&T. Here is a company that earned its place in the pantheon of great stocks simply by increasing its dividend for an absurdly long period of time.2007, W. Randall Jones, Julie M. Fenster, The Greatest Stock Picks of All Time, Crown Business, →ISBN, page 245

   Synonyms:

   mother, father, grandfather, grandmammy