re·trace / rēˈtrās/ • v. [tr.] go back over (the same route that one has just taken): he began to retrace his steps to the parking lot. ∎ discover and follow (a route or course taken by someone else): I've tried to retrace some of her movements. ∎ trace (something) back to its source or beginning: I wanted to retrace a particular evolutionary pathway. ∎ trace (lines of drawing or writing) again.