touch on


Also, touch upon.

1

Mention briefly or casually in passing, as in He barely touched on the subject of immigration. [First half of 1600s]

2

Approach closely, verge on, as in This frenzy touched on clinical insanity. [Early 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.