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sit in Definition
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sit in
noun(sit-in)sit-down
sit in
noun(sit-in)an act of occupying seats in a racially segregated establishment in organized protest against discrimination
sit in
noun(sit-in)an act of sitting in the seats or on the floor of an establishment as a means of organized protest
sit in
verb(sit-in)to take part in or be present at a session of music or discussion as a visitor —often used with on
sit in
verb(sit-in)to participate in a sit-in
sit in
idiom(sit-in)to say whether or not someone or something is morally good, proper, etc.
sit in
phrasal verb(sit-in)to attend (something, such as a class or meeting) without officially participating