Where does this definition of sit in on come from?
This entry for sit in on is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is sit in on a noun, verb, or something else?
In this entry, sit in on is tagged as 2v..
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.