jingle shell
Americannoun
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any of several marine, bivalve mollusks of the genus Anomia, having a thin, pearly shell with a conspicuous hole or notch near the hinge of the lower valve.
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the shell itself.
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.