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blacktip shark

American  
[blak-tip] / ˈblækˌtɪp /

noun

  1. a widely distributed sand shark, Charcharinus limbatus, having fins that appear to have been dipped in ink, inhabiting shallow waters of warm seas.

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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.