Word Association Game

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Twain

Trivia question: What does "mark twain" mean?

What does "Mark Twain" mean?
On the river, the depth of the water was vitally important. A mark was the same as a fathom on the sea or six feet. Twain means two. If the man checking the depth called out "Mark Twain," it meant a depth of twelve feet, "safe water" for riverboats of the day.
 
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