sit in

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sit in

A student asks to sit in on a history lecture.

Definition
  1. Verb (intransitive):
    • To attend or be present at a meeting, class, or event as a visitor or observer, not as a regular participant. This is the most common usage, implying passive attendance with permission.
    • To participate in a form of protest or demonstration by occupying a place, such as a building or office, and refusing to leave. This usage refers to an act of civil disobedience.
Examples of Usage
  • Verb (as an observer):

    • The professor allowed me to sit in on the lecture to see if I liked the course.
    • May I sit in during your team meeting this afternoon?
  • Verb (as a protest):

    • Students plan to sit in at the administration building until their demands are heard.
    • The activists sat in at the factory gates to protest the layoffs.
Advanced Usage
  • "to sit in on something": This phrasal verb construction is almost always used when referring to attending as an observer. The preposition "on" is followed by the event (e.g., a meeting, a class, a session).

    • She asked to sit in on the board's deliberations.
  • "to sit in for someone": This is a related but distinct phrasal verb meaning to temporarily take someone's place or perform their duties.

    • I will be sitting in for the manager while she is on vacation. (Note: This is listed as a related variant, not the core definition of "sit in").
Variants and Related Words
  • Sit-in (noun): A form of protest in which demonstrators occupy a place. This is the noun form derived from the verb's protest meaning.

    • The sit-in lasted for three days before an agreement was reached.
  • Sit in for (phrasal verb): To act as a substitute or temporary replacement.

    • Can you sit in for me at the committee meeting tomorrow?
Synonyms
  • Observe: To watch or notice, especially in a formal context (for the observer meaning).
  • Audit: To attend a class without receiving academic credit (specific to educational settings).
  • Occupy: To take control or possession of a space, especially as a protest (for the protest meaning).
Related Phrasal Verbs
  • Sit in on: To attend as an observer or visitor. This is the core phrasal verb for the primary definition.
    • Journalists were allowed to sit in on the closed-door hearing.
Related Idioms
  • No direct idioms are primarily formed with "sit in." Its meanings are largely conveyed through the standard phrasal verb constructions "sit in on" and "sit in for."
sit in

A student asks to sit in on a history lecture.

Verb
  1. participate in an act of civil disobedience
  2. attend as a visitor
    • Can I sit in on your Intermediate Hittite class?