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An honest and trustworthy person who is straightforward in dealings with others. A less common variant of "straight shooter." Joe's a square shooter—if he says that Alice is taking money out of the cash register, then I believe him. Sal's a real square shooter. If you ask for his opinion, he'll tell you without trying to sugarcoat it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. an honest person. (see also straight shooter.) He wouldn’t do anything shabby. He’s a square shooter.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.