From Longman Dictionary of Contemporary Englishletterboxlet‧ter‧box /ˈletəbɒks $ ˈletərbɑːks/ noun [countable] 1 DTCM British English a narrow hole in a door, or a special box outside a house where letters, packages etc are delivered SYN mailbox American English2 British EnglishTCM a box in a post office or street, in which letters are posted SYN postbox British English, mailbox American English
Examples from the Corpus
letterbox• They had velvet flaps over them like letterboxes.• The first I heard of my part in Talking Heads was when the script was pushed through my letterbox.• The rattle of the letterbox told her that the postman had just delivered the mail.• It's when the dreaded insurance renewal drops through the letterbox.• So he poked his nose through the letterbox.• Through the letterbox, they saw her lying in the hall, covered in blood.• The letterbox clashed and no letters came.• Lancre people didn't bother much with letterboxes. 