WordReference Random House Unabridged Dictionary of American English © 2017
straight and narrow, 
  • the way of virtuous or proper conduct:After his release from prison, he resolved to follow the straight and narrow.
    • 1945–50

    Collins Concise English Dictionary © HarperCollins Publishers::

    straight and narrow n
    1. informal the proper, honest, and moral path of behaviour
    Etymology: perhaps an alteration of strait and narrow, an allusion to Matthew 7:14: ``strait is the gate, and narrow is the way, which leadeth unto life''

    'straight and narrow' also found in these entries:

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