Dictionary
sit in
intransitive verb
Definition of SIT IN
1
: to take part in or be present at a session of music or discussion as a visitor —often used with on <invited to sit in on a rehearsal>
2
: to participate in a sit-in
ADVERTISEMENT
First Known Use of SIT IN
1868
Seen & Heard
What made you want to look up sit in? Please tell us where you read or heard it (including the quote, if possible).