touch on
Also, touch upon.
Mention briefly or casually in passing, as in He barely touched on the subject of immigration. [First half of 1600s]
Approach closely, verge on, as in This frenzy touched on clinical insanity. [Early 1800s]
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Words nearby touch on
touchline, touchline ban, touchmark, touch-me-not, touch off, touch on, touchpad, touch paper, touch plate, touch-ready, touch rugby
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.