Challenged to substantiate his accusation, the MP had to withdraw, shouted down by his fellow Labour MPs.
It's why it is so important to substantiate both the plot, and its connection to Iran.
Thus, catharsis, in a physiological sense, has been difficult to substantiate, but the results are by no means conclusive.
If the emails released today substantiate these claims, Hunt's career could be in jeopardy.
So, President Obama does right by making every effort to substantiate the charges against Assad.
How could Mr. Ferris substantiate by proof any of the damaging allegations he had made against publishers of high standing?
Now here is a fact which official records go to substantiate.
Well, the only thing that looks that way is a story that nobody has been able to substantiate.
Then he would do so for me and bring proofs to substantiate his statements.
As we have hinted at the strength of his memory, we will now produce some facts to substantiate the truth.
1650s, "to make real, to give substance to," from Modern Latin substantiatus, past participle of substantiare, from Latin substantia (see substance). Meaning "to demonstrate or prove" is attested from 1803. Related: Substantiated; substantiating.