letterbox vs tin

letterbox

noun
  • A hidden container that holds a logbook and rubber stamp, found by following clues as a form of recreation. 

  • A rectangular hole or slot. 

  • A delivery point for mail, a box, compartment or slot for this purpose. 

  • A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose. 

verb
  • To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area. 

  • To hunt for letterboxes (containers with logbook and rubber stamp) by following clues. 

adj
  • Transferred to home video formats while preserving the original aspect ratio, having black bars above and below the picture area. 

tin

noun
  • An airtight container, made of tin or another metal, used to preserve food, or hold a liquid or some other product. 

  • A metal pan used for baking, roasting, etc. 

  • A malleable, ductile, metallic element, resistant to corrosion, with atomic number 50 and symbol Sn. 

  • computer hardware. 

  • The bottom part of the front wall, which is "out" if a player strikes it with the ball. 

adj
  • Made of galvanised iron or built of corrugated iron. 

  • Made of tin. 

verb
  • To coat with solder, in order to consolidate braided wire, so as to make contact with all strands and reduce fragility of the fraying wire 

  • To cover with tin. 

  • To place into a metal can (ie. a tin; be it tin, steel, aluminum) in order to preserve. 

  • To coat with solder, in preparation for soldering, to ensure a good solder joint 

How often have the words letterbox and tin occurred in a corpus of books? (source: Google Ngram Viewer )