Definitions of substantiate:

• verb:   solidify, firm, or strengthen

  Example: "The president's trip will substantiate good relations with the former enemy country"

• verb:   represent in bodily form

  Example: "The painting substantiates the feelings of the artist"

• verb:   establish or strengthen as with new evidence or facts
• verb:   make real or concrete; give reality or substance to

  Example: "Our ideas must be substantiated into actions"