straight and narrow

noun
the way of virtuous or proper conduct: After his release from prison, he resolved to follow the straight and narrow.

Origin:
1945–50

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World English Dictionary
straight and narrow
 
n
informal the proper, honest, and moral path of behaviour
 
[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'']

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Example sentences
That's how the local government monitors traffic, chases down leaky water
  mains, and keeps tourists on the straight and narrow.
Martial arts and helping animals keep him on the straight and narrow.
To occupy his time, he had to veer off the straight and narrow.
The sinner should be brought back onto the straight and narrow road.
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