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Wiktionary
big enchilada

n. 1 (context idiomatic English) A very important person, especially the highest-ranking individual in an organization. 2 (context idiomatic English) Some item of high value, especially a top prize or reward.

WordNet
big enchilada

n. an important influential person; "he thinks he's a big shot"; "she's a big deal in local politics"; "the Qaeda commander is a very big fish" [syn: big shot, big gun, big wheel, big cheese, big deal, big fish, head honcho]