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third-person singular simple present touches on, present participle touching on, simple past and past participle touched on
(transitive, idiomatic) To mention briefly; to cursorily discuss. examples
(transitive, idiomatic) To come or go to for a short time. quotations examples
I made a little voyage round the lake, and touched on the several towns that lie on its coasts.
1705, J[oseph] Addison, Remarks on Several Parts of Italy, &c. in the Years 1701, 1702, 1703, London: […] Jacob Tonson, […]