Wordnet 3.0
NOUN (1)
1. 
 an important influential person; 
- Example: "he thinks he's a big shot"- Example: "she's a big deal in local politics"- Example: "the Qaeda commander is a very big fish"[syn: big shot, big gun, big wheel, big cheese, big deal, big enchilada, big fish, head honcho]
WordNet (r) 3.0 (2006):
big cheese
    n 1: 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 enchilada,
         big fish, head honcho]