A short phrase is usually not protected by copyright
Copyright protects original creative works, not names, titles, slogans, or brief phrases
If the phrase is part of a larger original work, the full work may be copyrightable
To protect a phrase, consider trademark protection instead of copyright
Search existing trademarks before using or filing for a phrase
Use the phrase in commerce if you want trademark rights in some jurisdictions
File a trademark application with the appropriate government office
Keep records showing first use of the phrase
Consult a qualified intellectual property attorney for advice on your specific phrase