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Idioms and Phrases with thumbnail sketch

thumbnail sketch

A brief outline or cursory description, as in Let me give you a thumbnail sketch of the situation. This idiom alludes to drawing a picture no larger than a thumbnail. [Mid-1800s]

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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.