"Knew inside out" is an idiomatic expression used to describe an individual's extremely thorough understanding or knowledge of a particular subject, situation, or person. The phrase implies an in-depth familiarity and expertise that goes beyond a superficial level, suggesting that the person possesses an intimate and detailed awareness of all aspects related to the subject matter.
When someone knows something "inside out," they are well-acquainted with the intricate details, nuances, and workings of that thing. It suggests that the person has thoroughly explored and studied the subject, leaving no stone unturned. Such knowledge is often gained through extensive research, personal experience, or long-term involvement in the subject matter.
The phrase can also apply to situations or people. An individual who knows a situation "inside out" is not only aware of the current circumstances but also has a deep understanding of the underlying factors, historical context, and future implications. Similarly, someone who knows a person "inside out" has a comprehensive understanding of their personality, habits, strengths, weaknesses, and motivations.
Overall, the expression "knew inside out" signifies a high level of familiarity, expertise, and comprehensive understanding, indicating that the person possesses an extensive knowledge base and a deep grasp of the subject matter, situation, or person.
