sit in
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.sit in
intransitive verbDefinition 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
First Known Use of SIT IN
1868
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