expression, noun
book of secrets; inside information; trade secrets
Refers to a document or knowledge containing confidential tips, tricks, or know-how, often in business, crafts, or specialized fields. Idiomatic, derived from the legendary Chinese military text.
彼はその業界の虎の巻を持っていると言われている。
He is said to have the inside secrets of that industry.
expression, noun
study guide; crib; answer key
Commonly used for supplementary materials that reveal answers, solutions, or effective study methods for textbooks or exams. Often has a slightly informal, 'cheat sheet' connotation.
試験前に友達から虎の巻を借りた。
I borrowed a study guide from a friend before the exam.
この参考書はまるで虎の巻だ。
This reference book is practically a crib.