sit in

Verb
  1. Attend as a visitor (synset 202619175)
    "Can I sit in on your Intermediate Hittite class?"
    is a type of: attend, go to - be present at (meetings, church services, university), etc.
  2. Participate in an act of civil disobedience (synset 202549179)
    is a type of: disobey - refuse to go along with; refuse to follow; be disobedient

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