A pillar box is the red street box letters are posted into. Post it in the pillar box.
Each carries the initials of the monarch reigning when it was cast, which dates it. A pillar box was first painted green and was changed to red so people could find it.
1nounpillar boxThe red street box letters are posted into.
“The pillar box on the corner is collected once a day at four.”
pillar box is a box.
Practised in Bank & Post Office