Substantiate

Prosecutors in court have to substantiate their claims in order to prove a suspect is guilty.

I am going to substantiate this theory.

Can you substantiate that claim?

Sami won't be able to substantiate that alibi.

substantiate allegations

substantiate a claim

The lawyer was asked to substantiate her claims.

He could not substantiate the rumors with evidence.

However, as the hospital equipment was installed by German firms, it is thought probable that the locomotive came from the same source, and this theory is substantiated by the fact that the control mechanism is of German manufacture.