learn from the bottom up

learn (something) from the bottom up

1. To learn or become knowledgeable about every or nearly every aspect of something, from the most mundane to the most nuanced. After working at this company for nearly 30 years, I've learned it from the bottom up. As the chief tax law specialist, it's my role to learn these new tax regulations from the bottom up.
2. To become knowledgeable about or skilled in something by beginning at the most basic level and then working one's way up to the more complicated or difficult aspects. I actually never had any sort of preternatural skill with mathematics—I had to learn it from the bottom up, just like most other students. I hard forgotten everything I knew about Japanese, so when I started studying it again in my 30s, I had to learn it from the bottom up all over again.
See also: bottom, learn, up
Farlex Dictionary of Idioms.

learn something from the bottom up

Fig. to learn something thoroughly, from the very basics; to learn all aspects of something, even the least important ones. I learned my business from the bottom up. I started out sweeping the floors and learned everything from the bottom up.
See also: bottom, learn, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • learn (something) from the bottom up
  • learnt
  • every inch a/the leader, star, hero, etc.
  • every which where
  • every other
  • every which way
  • every single one
  • nook and cranny
  • nook or cranny
  • nooks and crannies