Where does this definition of blue moon come from?
This entry for blue moon is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is blue moon a noun, verb, or something else?
In this entry, blue moon is tagged as 2n..
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.