Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Informal any dealing that is honest and fair
Used by arrangement with John Wiley & Sons, Inc.
square deal - Phrases/Idioms
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.
A just, equitable arrangement or transaction, as in I know I'll get a square deal if I work with that supplier. This idiom uses square in the sense of “fair” or “honest,” a usage dating from the 1300s. [Late 1800s]