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Related question: Idiom for a person who knows every detail about something (which is also coincidentally asked by me!)

I'm asking for an idiom describing the details themselves, not the person who knows them. Some of the answers in the above link would be valid here, like jot and tittle.

My own guess would be something like this:

Since he developed this software framework himself, he knows the _____ (and) _____ of it.

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  • I guess know-it-all refers to the person, but as I stated in my question, I want an idiom describing the details. It could be posted in the link I provided in the beginning of my post (which asks for an idiom describing the person), however, I think know-it-all has a negative sense to it and doesn't apply to that question either.
    – Behdad
    Commented Oct 3, 2015 at 10:10
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    Since he developed this software framework himself, he knows all the ins and outs of it.
    – Joe Dark
    Commented Oct 3, 2015 at 10:13
  • @JoeDark you should post that suggestion, it's the one that popped into my head first.
    – Mari-Lou A
    Commented Oct 3, 2015 at 11:42
  • The answers on this post are very similar to the ones you have provided the link to. I was expecting to see terms that described the person him/herself, not the depth of their knowledge.
    – Mari-Lou A
    Commented Oct 3, 2015 at 11:48
  • @JoeDark Please post your comment as an answer, so far that is the best answer I've seen and it's the candidate to be accepted.
    – Behdad
    Commented Oct 3, 2015 at 12:22

4 Answers 4

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Since he developed this software framework himself, he knows the ____ and ____ of it.

Since he developed this software framework himself, he knows the ins and outs of it.

Ins and outs:

  1. characteristic peculiarities or technicalities : workings
  2. ramifications
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  • If you provide links to definition of this, I would accept this answer. Thank you.
    – Behdad
    Commented Oct 4, 2015 at 10:34
  • Done (picked the first google hit).
    – Drew
    Commented Oct 4, 2015 at 14:58
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  • knows it inside and out

To know something "inside out" or "inside and out"?

  • knows it from A to Z

http://dictionary.cambridge.org/us/dictionary/english/from-a-to-z

  • knows it backwards and forwards

http://idioms.thefreedictionary.com/know+backwards+and+forwards

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He knows it from the ground up.

from the ground up: from the most basic level to the highest level; completely (American Heritage Dictionary)

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You could say that he knows all the specifics:

  • exact details. (Cambridge Dictionary)

  • distinct items or details; particulars (AHD)

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  • Thanks for your answer, but I'm looking for an idiom. Can you think of an idiom I can use?
    – Behdad
    Commented Oct 3, 2015 at 9:34

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