sit in

Other Definitions
sit in (enc)

Verb	1.	sit in - attend as a visitor; "Can I sit in in your Intermediate Hittite class?" attend, go to - be present at (meetings, church services, university), etc.; "She attends class regularly"; "I rarely attend services at my church"; "did you go to the meeting?"
	2.	sit in - participate in an act of civil disobedience disobey - refuse to go along with; refuse to follow; be disobedient; "He disobeyed his superviser and was fired"

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