1. to provide evidence or proof to support or verify something
Usage: third person singular present tense of ‘substantiate’

Examples

• The witness testimony substantiates the defendant’s alibi.
• New research substantiates the theory about climate change.
• The document substantiates her claim to the property.
• Evidence from the crime scene substantiates the detective’s hypothesis.
• The audit substantiates the company’s financial reports.
• Historical records substantiate the legend about the ancient battle.