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touch on (something)
To discuss or deal with some topic informally or in passing. We'll touch on the matter later in the meeting, so let's stay focused on the issue at hand. She touched on the problem, but she didn't get a chance to explain exactly what had happened. The movie touches on themes of loneliness and grief, but doesn't make them the central focus of the characters.
touch (up)on something
Fig. to mention something; to talk about something briefly. In tomorrow's lecture I'd like to touch on the matter of taxation. The teacher only touched upon the subject. There wasn't time to do more than that.
touch on something
Fig. to mention something; to talk about something briefly. In tomorrow's lecture I'd like to touch on the matter of taxation. The teacher only touched on the subject. There wasn't time to do more than that.
Also, touch upon.
1. Mention briefly or casually in passing, as in He barely touched on the subject of immigration. [First half of 1600s]
2. Approach closely, verge on, as in This frenzy touched on clinical insanity. [Early 1800s]
touch onor touch upon
1. To deal with some topic in passing: The speech touched on all the important issues but never really discussed them.
2. To relate to someone or something; concern someone or something: The problem of poverty touches on every level of society.
3. To approach the nature or condition of something; come close to something: The fan's excitement touched on clinical insanity.