Christmas Music Trivia Contest: Day 2

 Day Two! Below is one of my favorite versions of "Jingle Bells"--three-hundred-something voices singing a capella is pretty impressive. 

Today's trivia question: What part of speech is the word" jingle"? Google is allowed. 

Leave your answer below for one entry in the contest. For an extra entry you can:
1. Facebook or Tweet the contest.
2. Explain what "bobtail" refers to in the song. 

Details of the contest are below. And if you want to enter for Day 1, click here.
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Here's how it works:
1. Every day or two (or three), I'll post a seasonal song and ask a trivia question about it. 
2. Everyone who comments and answers correctly gets one entry in the giveaway to be held at the end of the contest. Googling answers is entirely acceptable. You may leave a comment on this post as well--it starts now. 
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3. You may answer any of the questions as long as the contest is going. 
4. You can get an extra entry for tweeting or sharing on Facebook. Just leave that in your comment. One entry for each day you do that. 
5. The contest ends whenever I say it ends. Probably January 1st. But we'll see.
6. At the end of the contest, I will do a drawing. 
7. The winner of the drawing gets to pick their prize from the following list. The runner-up gets to pick their prize from the remaining list. And the second-runner up then picks from the remaining items. And so on. We'll give away as much stuff as we have, so there will be multiple winners. 

There might be more prizes, so stay tuned. Because I hang with authors, most of the prizes are book. As of now, here are some of the books that wonderful people have donated (click on the title for more information about each book):

1. Mark of the Thief by Jennifer Nielsen
2. Mysteries of Cove: Fires of Invention by J. Scott Savage
3. A Midwinter Ball by Heidi Ashworth, Annette Lyon, and Michele Paige Holmes (A collection of Regency-era romantic novellas--e-book version).
4. A Night Divided by Jennifer Nielsen
5. Ebook copies of The Kindling, Penumbras, or Luminescence by Braden Bell.
6. Jack: The True Story of Jack and the Beanstalk by Liesl Shurtliff