A copywriter I'm working with wrote "One-Day Only Promotion" but my feeling is that "One-Day-Only Promotion" is correct. The first three words describe 'Promotion'. I know you don't hyphenate adverbs, ...
Is it chainsaw-equipped or chainsaw equipped? And with what kind of former words to use "-" properly?
What is the correct use of the term "related?" For example, should I use it like computer related, or is it more proper to use computer-related (where the word "computer" is just part of my ...