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Why is the ninth month called September?

Have no effect or influence on one, as in Ned's attempts at humor were lost on Meg, or David's kindness was not lost on his aunt. This expression uses lost in the sense of “wasted.” [ c. 1600 ]
Also see: you've lost me
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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