"Idiom Dictionary" is a reference book that contains a large number of idioms, aiming to help people understand and learn Chinese idioms. This dictionary is usually indexed according to Chinese character strokes, pinyin, radicals, etc. to facilitate readers' search. Each included idiom usually has a brief explanation explaining the meaning, origin, usage, etc. of the idiom, which helps readers better understand and use these idioms. "Idiom Dictionary" is one of the important tools for learning Chinese and improving language skills.