touch on

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touch on (third-person singular simple present touches on, present participle touching on, simple past and past participle touched on)

  1. (transitive, idiomatic) To mention briefly; to cursorily discuss.
    We touched on the subject of wages, but we didn't reach a conclusion.
  2. (transitive, idiomatic) To come or go to for a short time.
    • 1705 (revised 1718), Joseph Addison, Remarks on Several Parts of Italy
      I made a little voyage round the lake, and touched on the several towns that lie on its coasts.