There are 2 definitions of sit in in English:

sit in1

1(Of a group of people) occupy a place as a form of protest: students have been sitting in on and off this week
More example sentences
  • The next morning Jesse Jackson would come and compare us to young folks sitting in for civil rights for black citizens during his youth.
  • Just as we were ready to enter Allen's office to sit-in we learned that he had decided to vote against any more funding for the occupation.
  • We had been condemning segregation verbally for a long time, but we had lent ourselves to it by not sitting in.
2Attend a meeting or discussion without taking an active part in it: I sat in on a training session for therapists
More example sentences
  • The school was also ranked third in the country when inspectors sat in on lessons.
  • The visiting teachers sat in on lessons and had the chance to talk to both teachers and pupils.
  • Three years ago Camalyn had gone into work with her mother and sat in on one of the anger management classes.
Synonyms
attend, be present at, be an observer at, observe, watch; North Americanaudit
See parent entry: sit

Definition of sit in in:

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There are 2 definitions of sit in in English:

sit-in2

Line breaks: sit-in

noun

A form of protest in which demonstrators occupy a place, refusing to leave until their demands are met.
More example sentences
  • This was a time of rallies, demonstrations, sit-ins, walkouts, and protests of every kind, and the music reflected the spirit of the time.
  • Television cameras covered the marches, boycotts, sit-ins and when demonstrators were confronted by Police.
  • Rallies, protests, sit-ins, and marches have today been held in the town centre.

Definition of sit in in: