To know backwards and forwards means to have an extensive and comprehensive understanding or mastery of something, such that one is able to recall or perform it flawlessly, effortlessly, and in any given situation. This idiomatic expression derives from the notion of figuratively knowing a subject so well that one can mentally navigate through it both forward and backward without hesitation or difficulty.
When a person knows something backwards and forwards, they possess a deep and complete familiarity with the subject matter, typically acquired through extensive study, practice, or experience. This phrase is commonly used in the context of knowledge, skills, or information that has been thoroughly internalized and ingrained in one's memory, such as a complex topic, a job role, a musical composition, or a sports technique.
Someone who knows a song or a poem backwards and forwards can effortlessly recite it in its entirety, regardless of whether they start from the beginning, the middle, or the end. Similarly, an individual who knows a subject matter backwards and forwards can effortlessly answer any question, overcome any challenge, or provide a detailed explanation without hesitation or ambiguity. It implies a level of expertise or familiarity that transcends mere knowledge and reaches a level of complete mastery.
Overall, to know something backwards and forwards denotes an exceptional depth of understanding or ability, emphasizing the full scope of knowledge or command over a particular area.
