# sit in

idiom

Source: https://englishreference.com/idiom/sit-in
Updated: 2026-08-10

## Meaning

To attend a class, educational presentation, meeting, etc. for one time, as a visitor.

## Examples

- I will sit in on the meeting today.
- The professor allowed me to sit in on her lecture to see if I liked the course.
- Although he was not officially enrolled in the seminar, the curious student asked for permission to sit in on the discussion to broaden his understanding of the topic.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.