breastplate vs steel

breastplate

noun
  • A piece of armor that covers the chest. 

  • A piece of horse tack designed to prevent the saddle slipping backwards. 

  • A piece of silicone in the shape of women's breasts worn by drag queens and other female impersonators to simulate a female body shape. 

  • An embroidered square of linen worn on the breast of the Jewish high priest, bearing twelve precious stones, each inscribed with the name of one of the tribes of Israel. 

steel

noun
  • Armor. 

  • Extreme hardness or resilience. 

  • Varieties of this metal. 

  • The gray hue of this metal; steel-gray, or steel blue. 

  • A honing steel, a tool used to sharpen or hone metal blades. 

  • An artificial metal produced from iron, harder and more elastic than elemental iron; used figuratively as a symbol of hardness. 

  • An engraving plate 

  • Pieces used to strengthen, support, or expand an item of clothing. 

  • A type of slide used while playing the steel guitar. 

  • Projectiles. 

  • Bladed or pointed weapons, as swords, javelins, daggers. 

  • A fringe of beads or decoration of this metal. 

  • A sewing needle; a knitting needle; a sharp metal stylus. 

  • A piece used for striking sparks from flint. 

  • A flat iron. 

verb
  • To cause to resemble steel in appearance. 

  • To steelify; to turn iron into steel. 

  • To edge, cover, or point with steel. 

  • To sharpen with a honing steel. 

  • To harden or strengthen; to nerve or make obdurate; to fortify against. 

  • To press with a flat iron. 

  • To electroplate an item, particularly an engraving plate, with a layer of iron. 

adj
  • Made of steel. 

  • Similar to steel in color, strength, or the like; steely. 

  • Of or belonging to the manufacture or trade in steel. 

  • Engraved on steel. 

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