down through something
down through (something)
Throughout (a long period of time). Oh, problems like this have been happening down through the ages—we'll find a solution.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
down through something(written) during a long period of time: Down through the years this town has seen many changes.
Farlex Partner Idioms Dictionary © Farlex 2017