scratch the surface

scratch the surface idiom
Investigate or treat something superficially, as in This feed-the-hungry program only scratches the surface of the problem, or Her survey course barely scratches the surface of economic history. This metaphoric term transfers shallow markings made in a stone or other material to a shallow treatment of a subject or issue. [Early 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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