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a thumbnail sketch

a brief or small picture or description. The manager gave a thumbnail sketch of her plans. The student wrote a thumbnail sketch of his project.
See also: sketch, thumbnail

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]
See also: sketch, thumbnail

thumbnail sketch

n. a quick and concise description. (One that could be written on someone’s thumbnail.) Let me give you a thumbnail sketch of what happened.
See also: sketch, thumbnail