What do Scottish kilts, machine gun ammunition, cement mixers, graves, and Queen Elizabeth II’s wedding dress all have in common? They are all purported to be tied to the origins of the expression “the whole nine yards.” I have heard and read emphatic declarations that the real origin is . . . you fill in the blank. According to the New York Times, which ran a story on this topic on December 26, there is no clear answer. (I guess it was a slow news day.) They went on to quote language expert Ben Zimmer, “The phrase is interesting because it’s so mysterious.” Whatever its origin, most people who are fluent in English know what it means. Since its meaning is clear and its origin is so muddled, it is probably a safe.