1. (v. t.) To make to exist; to make real.

2. (v. t.) To establish the existence or truth of by proof or competent evidence; to verify; as, to substantiate a charge or allegation; to substantiate a declaration.

adduce affirm anatomize assay atomize attest authenticate back back up bear out body bolster bring to test buttress certify circumstantiate cite confirm corporealize corporify corroborate cut and try demonstrate descend to particulars detail document embody enter into detail essay experiment exteriorize externalize fortify give a try give a tryout give full particulars have a go incarnate incorporate instance itemize justify manifest materialize objectify particularize personalize personify play around with practice upon probate prove put to trial ratify reembody reincarnate reinforce research road-test run a sample sample shake down specify spell out strengthen substantialize substantify support sustain taste test transmigrate try try it on try out undergird uphold validate verify warrant