sit in

Definitions of sit in
  1. verb
    attend as a visitor
    “Can I sit in on your Intermediate Hittite class?”
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    type of:
    attend, go to
    be present at (meetings, church services, university), etc.
  2. verb
    participate in an act of civil disobedience
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    type of:
    refuse to go along with; refuse to follow; be disobedient
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