Where does this definition of research into come from?
This entry for research into is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is research into a noun, verb, or something else?
In this entry, research into 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.