granddaddy

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grand·dad·dy / ˈgranˌdadē/ (also gran·dad·dy) • n. (pl. -dies) another term for granddad. ∎  (the granddaddy of) used to denote a person or thing that is considered to be the best, largest, or most notable of a particular kind: that young fellow is going to have the granddaddy of all headaches.

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