Trickle-down economics specifically refers to economic policy that favors the wealthy and corporations with the argument that this will lead to wealth trickling down to the economically less fortunate. Examples include the Reagan and Trump tax cuts.

This has been studied somewhat extensively (https://academic.oup.com/ser/article/20/2/539/6500315?login=... is one example), and it’s been shown over and over that this does in fact not work and leads to larger wealth disparity, across many countries where it has been attempted.

It’s possible you’re working off some other definition of the term based on your comment but that’s the generally accepted usage.