case in point
A relevant example or illustration of something, as in A case in point was the collision of a cyclist with a pedestrian crossing the designated bike path. [Mid-1700s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.