WordWeb Online

1. Serving to support or corroborate
   "substantiating evidence"
   - collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiative, validating, validatory, verificatory, verifying

1. Establish or strengthen as with new evidence or facts
   "his story substantiated my doubts"
   - confirm, corroborate, sustain, support, affirm
    
2. Represent in bodily form
   "The painting substantiates the feelings of the artist"
   - incarnate, body forth, embody
    
3. Make real or concrete; give reality or substance to
   "our ideas must be substantiated into actions"
   - realize, realise [Brit], actualize, actualise [Brit]
    
4. Solidify, firm, or strengthen
   "The president's trip will substantiate good relations with the former enemy country"

See also: substantiation, supportive

Type of: be, beef up, create, fortify, make, strengthen