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Definition of sit in on phrasal verb from the Oxford Advanced Learner's Dictionary

sit in on

phrasal verb
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sit in on something
  1. to attend a meeting, class, etc. in order to listen to or learn from it rather than to take an active part
    • I was allowed to sit in on an executive meeting.
See sit in on in the Oxford Advanced American Dictionary
trait
noun
 
 
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B2
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