Check back next week for the answer. (For a heads-up, follow us on Facebook or Twitter.)

UPDATE July 7, 2015: The answer to the CMOS Challenge is that vice-president is not Chicago style. CMOS spells this term without a hyphen: vice president. You can learn more about Chicago-style hyphenation at section 7.85 in the 16th edition of The Chicago Manual of Style (our famous “Hyphenation Table”). And in case you’re curious, here’s how you voted:

vice-president: 70%
megamall: 17%
three-year-old: 9%
self-restraint: 4%

Please see our commenting policy.