Yeah, words just change meaning and it's frustrating because people generally change them in ways that make their usage more sloppy, less precise. I've had multiple arguments on HN about this with the term open source, but unfortunately you've already lost the battle with sideloading, at least according to Wikipedia.

> When referring to Android apps, "sideloading" typically means installing an application package in APK format onto an Android device. Such packages are usually downloaded from websites other than the official app store Google Play. For Android users sideloading of apps is only possible if the user has allowed "Unknown Sources" in their Security Settings.[1]