sit in

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sit in

1. verb To participate in a non-violent protest in which participants occupy a particular space and refuse to move. Students have been sitting in since Monday to protest discriminatory enrollment practices.
2. verb To attend something as a spectator or visitor, rather than a regular or full participant. Typically followed by "on (something)." They invited me to sit in on one of their meetings to see how things normally progress. I didn't earn any credit for it, but sitting in on the class gave me a lot of useful information that I could apply to my business.
3. verb To temporarily act as a substitute for someone else, especially in a meeting or discussion-based activity. Typically followed by "for (someone)." Hi, everyone, I'll be sitting in for Mike in today's meeting. He had to fly back to Memphis last night for a family emergency. Our manager is out of the office today, so Mary will be sitting in instead.
4. noun A non-violent protest in which participants occupy a particular space and refuse to move. As a noun, the phrase is hyphenated. Students have organized a sit-in to protest discriminatory enrollment practices.
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sit in (on something)

to attend something as a visitor; to act as a temporary participant in something. Do you mind if I sit in on your discussion? Please do sit in.
See also: sit

sit in

(for someone) to act as a substitute for someone. (Usually involves actual sitting, such as at a meeting.) I am not a regular member of this committee. I am sitting in for Larry Smith. Do you mind if I sit in? My representative can't be here.
See also: sit

sit in

1. Attend or take part as a visitor, as in My son's jazz group asked me to sit in tonight. It is often put as sit in on, as in They asked me to sit in on their poker game. [Mid-1800s]
2. Take part in a sit-in, that is, an organized protest in which seated participants refuse to move. For example, The students threatened to sit in unless the dean was reinstated. [c. 1940]
3. sit in on. Visit or observe, as in I'm sitting in on his class, but not for credit. [Early 1900s]
4. sit in for. Substitute for a regular member of a group, as in I'm just sitting in for Harold, who couldn't make it.
See also: sit

sit in

v.
1. To be present or participate as a visitor at a discussion or music session: The professor allowed me to sit in on one of her lectures. A guitarist will be sitting in with the band today.
2. To take part in a sit-in or similar organized protest: The protesters sat in at the construction site.
3. sit in for To act as a substitute: She will be sitting in for the usual news anchor, who is away on vacation.
See also: sit
References in periodicals archive ?
The sit ins have caused loss of billions of rupees to the national economy and damaged the image of Pakistan at the international level.
Talking to reporter, chief of Awami National Party Asfandyar Wali said the sit ins of PTI and PAT have besieged the federal capital for the last one month which is damaging for the country.
He said both sit ins are against the constitution and law, adding workers of the two parties who damaged government buildings and forcibly entered the building of Pakistan Television could be clearly seen in the camera footage.
The future of thousands of students have been put at stake due to sit ins and no steps could be taken for the sake of patients in hospitals.
The counsel for the petitioner told the court that business community has suffered heavily due to sit ins of PTI and PAT in Islamabad and future of national economy has been endangered.
The Minister said Imran Khan was trying to influence the judiciary by staging sit ins.