to attend something as an observer without being a full participant
to be there and watch without really joining in
One main meaning — here's how to use it.
to attend a class, meeting, or activity in order to observe it rather than fully participate
"The new manager sat in on the training session to see how it worked."
I sat in on the meetings.
— Various memoir/interview contexts; exact famous source not recalled
to sit inside while something is happening
to be there and watch without really joining in
Often used with classes, meetings, interviews, and rehearsals. Usually implies permission or temporary attendance.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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