sit in

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sit in

1. To take part 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 what they call "discriminatory enrollment practices."
2. 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. 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.
See also: sit

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 ?
I regularly sit in on the senior staff meeting, where we discuss the whole gamut of running the exchanges.