ins and outs

physical characteristics, as windings and turnings, nooks, or recesses: the ins and outs of a subterranean passage.
intricacies; particulars; peculiarities: the ins and outs of the tax laws.

1880–85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Idioms & Phrases

ins and outs

  1. The intricate details of a situation or process. For example, It takes a newcomer some time to learn the ins and outs of the legislative process, or David really knows the ins and outs of how this engine works. This usage alludes to the tortuous windings and turnings of a road or path. [Second half of 1600s]

  2. Those with position and influence and those without, especially those in office versus those who are not, as in "Juan stood well both with Ins and Outs" (Byron, Don Juan, 1823). [Mid-1700s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Her focused determination and dedication to the ins and outs of prepping seemed
  all the more remarkable.
He detailed the ins and outs of the life of the spaghetti farmer and
  anticipated questions about how spaghetti grows on trees.
The lack of a user manual makes learning the ins and outs of the device a slow
To somebody who doesn't follow the ins and outs of testing, the events of the
  past couple of weeks might seem contradictory.
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