Final answer:
The verb 'attest' means to declare something to be true based on personal experience or knowledge.
Step-by-step explanation:
The word attest as a verb means to declare to be true based on personal knowledge or belief. For instance, when someone has witnessed an event or an object firsthand, such as the Golden Gate Bridge, they may attest to its beauty by confirming its allure based on their observation.
Similarly, witnesses of natural phenomena like the movement of boulders in Death Valley can testify or attest to this occurrence because they have seen it happen.