虎とらの巻まきMeaningsExpressionNoun1. book of (trade) secrets; secrets (Idiom)2. study guide (to supplement a textbook); crib; key (Idiom)Other spellingsトラの巻まき0%Kanji used虎tiger巻scrollPitch accentとらのまきとらのまきExamples1これは野や球きゅうの虎とらの巻まきだ。This is the bible of baseball.