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Is Tuesday named for a one-handed god?

once in a lifetime

Extremely rare, especially as an opportunity. For example, An offer like that will come just once in a lifetime . This phrase, often used hyperbolically, was first recorded in 1854. Also see of one's life
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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