any of various small American freshwater fishes having glistening scales, esp. a minnow.
4.
any of various silvery, marine fishes, as the menhaden or butterfish.
5.
a defect in silk or synthetic filament or fabric, produced either in the process of winding or as a result of shuttle friction and appearing on fabric as a shiny streak.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: shin·er Pronunciation: 'shI-n&r Function: noun :BLACK EYE