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