Testify to Definition 1 of 3Pro Tip 1/3Abstract Concepts Used to emphasize the existence of abstract qualities, not just physical evidence. Their sincere smiles testify to the team's genuine camaraderie. Pro Tip 2/3Strong Evidence Suggests the evidence presented is powerful and convincing. The trophies in her room testify to her athletic prowess. Pro Tip 3/3Past Events Often used to reflect on historical events or situations. These ancient relics testify to a once-thriving civilization.