The Idiom Book: 1010 Idioms in 101 Two-Page Lessons - Paperbackby Elizabeth Niergarth (With), Hal Niergarth (Author) The Idiom Book was written for high intermediate advanced young adult and adult learners of English. The language used is very colloquial and is intended to represent the authentic linguistic expression of native speakers interacting socially in informal personal and professional contexts. Each lesson features 10 idioms. The book is divided into 101 lessons, with each lesson having four sections: