En Dash: What Is an En Dash?
When a compound adjective precedes a noun it is describing, we often need a hyphen: prize-winning recipe, twentieth-century literature. If a compound adjective comprises more than two words, we use as many hyphens as are needed: a three-day-old newspaper, a long-in-the-tooth baseball manager. Try however to punctuate the compound adjectives including proper nouns in these phrases: a …