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A fair, honest transaction, deal, or arrangement. The president said he will pull out of trade deal talks until he feels sure we are getting a square deal. We aren't looking to be paid or treated better than our peers—we just want a square deal. $300 for that crappy old computer? That doesn't sound like a square deal to me, dude.
a fair and honest transaction; fair treatment. All the workers want is a square deal, but their boss underpays them. You always get a square deal with that travel company.
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]
a square deala fair bargain or treatment.
Square here has the sense of ‘honest’, which as an adjective was associated originally with honourable play at cards. See also on the square (at square).