treat of
Advanced (C1)formal
To be about a topic, especially in a book or speech.
"The second volume treats of the philosophical implications of the discovery."
Hear it in context
Breaking the Habit of Overthinking: Rumination and the Insight Trap | Being Well
Forrest Hanson · 29:14
a big part of treat of the treatment
US-Iran maintain uneasy ceasefire, gas prices still climb, Democrats court defeat | The Hill Sunday
The Hill · 39:50
You uh that you're you're going to be in for a treat of as they bring