In the Know teaches over 800 colorful idioms in English. The book groups the idioms into units depending on whether the idioms relate to such concepts as danger or honesty, or whether they contain colors or parts of the body, etc. Each unit has a clear four-page format that presents the idioms, explores their meaning, and practices their use. In the Know teaches over 800 colorful idioms in English. The book groups the idioms into units depending on whether the idioms relate to such concepts as danger or honesty, or whether they contain colors or parts of the body, etc. Each unit has a clear four-page format that presents the idioms, explores their meaning, and practices their use. in the know cambridge cindy leaney english idioms idiom