Detailed Instructions: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Q: Article: For a long time now, I've been fascinated by common phrases and their origins- and just why we say what we say. I decided to consult the experts, sort through all the research and compile   the answers. Here are a few of the standouts. Q: Why do we"tie the knot  "when we get married? A: Knots have been a common metaphor   in marriage ceremonies all over the world and through time. The expression means"to unite in manage".  In the Hindu marriage ceremony, the groom ties a ribbon around the bride's neck. In ancient Rome, the bride wore a belt that was tied in a knot. The groom would then unfasten it on their first night together as husband and wife. Q: Why do we say"Many happy returns"? A: The phrase is short for"Many happy returns of the day", which is to say,"May this day return many times"or"May you have many more birthdays. " Q: How about"It's not over till the fat lady sings"? Where does that come from? A: This expression is usually phrased as"The opera isn't over till the fat lady sings. "It got its start as a popular saying when it was used by a sportswriter Dan Cook in 1976 to indicate that a sporting contest wouldn't end until time was called. Q: What's the story of"under the weather,"especially when the weather's just fine? A: There's probably a nautical   explanation. In days gone by, when people felt seasick, they were told to go below-decks and find a spot in the middle of the ship where the motion would be less noticeable. In that way, they literally took themselves"under the weather." 
 Answer: sport
A:
The phrase"It's not over till the fat lady sings"was first used in   _  .