1. To derive or originate from someone, something, or some place. The powerful corporation traces back nearly 200 years to a small manufacturing company in New York City. Investigators discovered that the drug money traced back to a US senator.

2. To discover the point of origin of someone or something by following a trail of information or series of events backward. In this usage, a noun or pronoun can be used between "trace" and "back." We were able to trace the assassination attempt back to a cartel in Mexico. Make sure you only pay in cash, as the police can trace back exactly where and when you use your card.