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a big shot
1. noun An important, successful, or influential person. Ever since Jack won the poker tournament, he walks around acting like he's some kind of big shot. Don't forget to dress up for work tomorrow. The company's corporate big shots are coming to visit.
2. adjective Indicative of power or importance. I doubt that a big shot office will entice her to work here.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
see under big cheese.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
big shotand bigshot
1. n. a very important person. I’m no big shot, but I do have a little power around here.
2. mod. mighty; overbearing; overly important. If you think that a big shot title impresses me, you’re wrong.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.