What's the meaning of idioms "school in" and "get something into bones"

Question

1. School in: I searched for it on the internet but couldn't find its meaning or anything related to it. I found this idiom in a past year question paper.

2. Get something into bones: I found this idiom in essay "First year at harrow" by Winston Churchill. Here is link to pdf version of essay.

   Thus, I got into my bones the essential structure of the ordinary British sentence -- which is a noble thing.

I inferred from it that he learned the essential structure of english thoroughly, but I couldn't find any such idiom on the internet.

Answer 1

To school in is an expression meaning to teach or train, generally a skill or craft.

It is frequently used in the passive to mean that someone had acquired skills:

He was schooled in the craft of stone-masonry.

It can also be used actively:

The poacher schooled his children in the art of catching birds.

The Oxford Dictionary defines schooled as: Educated or trained in a specified activity or in a particular way.

(https://en.oxforddictionaries.com/definition/schooled)