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