Bob Garfield and Mike Vuolo discuss a mystery word or phrase with lexicographer Ben Zimmer.     This week's episode is sponsored by The Great Courses and its series "Language A to Z." Order it at 80% off the original price by visiting thegreatcourses.com/lexicon.         Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at www.slate.com/podcastsplus.     Twitter: @lexiconvalley   Facebook: facebook.com/LexiconValley   Email: lexiconvalley@slate.com  

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