straight as an arrow
Honest, genuine, as in You can trust Pat with the money; he's straight as an arrow. This simile alludes to the arrow's undeviating flight through the air. [Second half of 1900s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for straight as an arrow
Contemporary Examples of straight as an arrow
Or is he just a straight-as-an-arrow Eagle Scout, far more Clark Kent than Superman?
