This is “Hyphens”, section 3.8 from the book Successful Writing (v. 1.0).
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A hyphen (-)A punctuation mark that combines words that work together to form a single description, or it breaks a word across two lines of text. looks similar to a dash but is shorter and used in different ways.
Use a hyphen to combine words that work together to form a single description.
The fifty-five-year-old athlete was just as qualified for the marathon as his younger opponents.
My doctor recommended against taking the medication, since it can be habit-forming.
My study group focused on preparing for the midyear review.
Use a hyphen to divide a word across two lines of text. You may notice that most word-processing programs will do this for you. If you have to manually insert a hyphen, place the hyphen between two syllables. If you are unsure of where to place the hyphen, consult a dictionary or move the entire word to the next line.
My supervisor was concerned that the team meet-
ing would conflict with the client meeting.