big daddy
big daddy {n.}, {slang}, {informal}
The most important, largest thing, person or animal in a congregation of similar persons, animals, or objects.
The whale is the big daddy of everything that swims in the ocean.
The H-bomb is the big daddy of all modern weapons.
Al Capone was the big daddy of organized crime in Chicago during Prohibition.
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Source: A Dictionary of American Idioms
