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