What is the meaning of shoring?

noun

• A beam or timber that is propped against a structure to provide support.
  • synonyms: shore
• The act of propping up with shores.
  • synonyms: shoring up, propping up

verb

• Serve as a shore to.
  • usage: "The river was shored by trees"
  • synonyms: shore
• Arrive on shore.
  • usage: "The ship landed in Pearl Harbor"
  • synonyms: land, set ashore, shore
• Support by placing against something solid or rigid.
  • usage: "shore and buttress an old building"
  • synonyms: prop up, prop, shore up, shore