Where does this definition of to sb.'s certain knowledge come from?
This entry for to sb.'s certain knowledge is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is to sb.'s certain knowledge a noun, verb, or something else?
In this entry, to sb.'s certain knowledge is tagged as 2adv..
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.