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Why is the ninth month called September?

Easy progress, as in We had a hard time setting up the new computer system but it'll be smooth sailing from here on . The smooth in this idiom alludes to calm waters, free from big waves or roughness, a usage dating from the late 1300s. The transfer to other kinds of easy progress dates from the second half of the 1900s. Also see plain sailing
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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