Testify and Testify to

Testify verb - To make a solemn declaration under oath for the purpose of establishing a fact.

Testify to and testify are semantically related In some cases you can use "Testify to" instead a verb "Testify".

Testify to verb - To declare (something) to be true or genuine.

Testify and testify to are semantically related in vouch for topic. Sometimes you can use "Testify" instead a verb "Testify to".