To talk about something quickly or without going into detail.
The teacher touched on climate change during the lesson, but we didn't discuss it deeply.
A: Did the manager talk about the new project? B: She just touched on it and said more details would come later.
In my presentation, I will touch on the main challenges facing young people today, but I won't have time to cover every issue.
Common mistake
✗The book touches about climate change.
✓The book touches on climate change.
'Touch ON' a topic — not 'about'.
Tell it apart
She touched on the budget.
mentioned it briefly
She went into the budget.
covered it in depth
Use 'touch on' when you only mention a topic for a short time, not when you discuss it in detail.Don't confuse with 'focus on', which means to discuss something in detail.
C2touch on sensitive/controversial/complex issue/topic/subject
To refer to a sensitive, controversial, or complex subject in a subtle or indirect way, often deliberately avoiding explicit mention.
During the interview, the politician touched on the recent scandal without ever naming those involved.
A: Did the CEO address the layoffs in her speech? B: She touched on the issue, but only in very general terms—she never gave any specifics.
While the author touches on the ethical implications of artificial intelligence, she avoids making any direct accusations or predictions.
Common mistake
✗He touched on about the affair.
✓He touched on the affair.
'Touch on' takes the object directly — no 'about'.
Tell it apart
She only touched on his past.
referred to it indirectly
She spelled out his past.
laid it out explicitly
Use this sense when someone hints at or alludes to a difficult or delicate subject without stating it openly. Common in formal discussions, journalism, or academic writing when direct reference may be inappropriate or too blunt.Unlike the B2 sense 'mention briefly', this sense involves a deliberate indirectness, often because the topic is sensitive or controversial. The speaker may not actually state the subject, but gives enough clues for the listener to understand.