Where does this definition of main line come from?
This entry for main line is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does main line appear elsewhere on Lughet?
Yes — main line appears under other sources or language pairs in Lughet's collection. See the list below.
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.