touch upon a subject

verb

Roget 595: expound upon a subject, dissert upon a subject^†, descant upon a subject, write upon a subject, touch upon a subject; treat a subject, treat a subject thoroughly, treat of a subject, take up a subject, ventilate a subject, discuss a subject, deal with a subject, go into a subject, go into a subject at length, canvass a subject, handle a subject, do justice to a subject.    hold forth [oral dissertation], discourse, delve into.    ... show more

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