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