The New Dictionary of Cultural Literacy, Third Edition. 2002. |
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once in a blue moon |
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To do something once in a blue moon is to do it very rarely: That company puts on a good performance only once in a blue moon. The phrase refers to the appearance of a second full moon within a calendar month, which actually happens about every thirty-two months. | 1 |
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| The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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