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