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straight arrow

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noun Informal.
  1. a person who manifests high-minded devotion to clean living and moral righteousness.
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Origin of straight arrow

First recorded in 1965–70
Related formsstraight-ar·row, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for straight arrow

straight arrow

noun
  1. informal, mainly US
    1. a clean-living and honest person
    2. (as modifier)a straight-arrow cop
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012