The “Idiom Identifier” converts an original text document to a “neutral” form containing no punctuation, no capital letters, and having only a single space between each word. Neutral form text also removes hidden markup such as line breaks, paragraph breaks or page breaks. The Idiom Identifier performs an enhanced text search to locate idioms listed in a library file. The Idiom Identifier marks each identified idiom in a marked-up copy of the original text document. A reader can click on the marked-up idiom to see a definition of the idiom.