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