pillar box
Longman Dictionary of Contemporary English 5++LDOCE 5++ˈpillar box noun 
[countable] British English old-fashionedTCM a large red tube-shaped box for posting letters that stands on streets in Britain 邮筒，信筒 SYN postbox, → letterbox
[countable] British English old-fashionedTCM a large red tube-shaped box for posting letters that stands on streets in Britain 邮筒，信筒 SYN postbox, → letterboxExamples from the Corpus
pillar box• How my heart leaped to see a red pillar box once more, on the other side of the compound!• Mrs Southworth from the Hall was at the pillar box, posting a letter.ˈpillar box nounChineseSyllable
Corpus posting red for large a box tube-shaped
pillar box
ˈpillar box
noun
[countable] British English old-fashioned a large red tube-shaped box for posting letters that stands on streets in Britain
SYN postbox ⇨ letterbox
ˈpillar box
noun[countable] British English old-fashioned a large red tube-shaped box for posting letters that stands on streets in Britain
SYN postbox ⇨ letterbox