Where does this definition of letter box come from?
This entry for letter box is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does letter box appear elsewhere on Lughet?
Yes — letter box 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.
