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treat of (something)
obsolete Of a piece of writing or speech, to discuss, focus on, or deal with some particular topic or subject. His address before parliament treated of the economic impact the legislation would have on the agricultural industry. The essay treats of the moral and philosophical implications of several theoretical economic models.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To deal with some subject or topic in writing or speech: The essay treats of courtly love.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.