Where does this definition of it is well known that come from?
This entry for it is well known that is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Does it is well known that appear elsewhere on Lughet?
Yes — it is well known that appears under other sources or language pairs in Lughet's collection. See the list below.
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.