JMdict: 1267620

虎の巻 【とらのまき】

  1. [exp,n] book of (trade) secrets; secrets
  2. [exp,n] study guide (to supplement a textbook); crib; key
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
虎 Tiger, Drunkard コ とら
巻 Scroll, Volume, Book, Part, Roll Up, Wind Up, Tie, Coil, Counter For Texts (or Book Scrolls) カン, ケン ま.く, まき, ま.き 6