1. The act of stamping or marking the back or reverse side of a document, envelope, or item.
Usage: commonly used in postal and philatelic contexts
2. In philately, the practice of collectors adding postmarks or stamps to the back of envelopes or postcards.
Usage: specialized; philatelic term

Examples

• The postal service uses backstamping to indicate the date and location of mail processing.
• Collectors value backstamping on vintage postcards as it provides historical information.
• The envelope showed clear backstamping from multiple sorting facilities.
• Backstamping helps postal workers track the route a letter has taken.
• Philatelists often study backstamping patterns to authenticate rare stamps.