Verb
(transitive, computing) To transfer data between two local devices, rather than to or from a remote device.
I'm going to sideload my computer's address book onto my mobile phone.
(transitive, computing) To install an app on a mobile device by using unofficial channels, such as avoiding the use of an app store by obtaining it directly from the developer or downloading from a software repository.
Source: en.wiktionary.orgAs long as everything is in place, you can now sideload the OTA file. Source: Internet
A ticket event stream can have a sideload that includes the ticket comments. Source: Internet
I needed to download the program that’s on the company’s website and sideload it onto my device. Source: Internet
It's possible to sideload many Android apps by downloading the card, and installing it via a file manager, but it requires some work. Source: Internet
This will launch a mostly blank screen with text near the bottom directing you on how to sideload an OTA. Source: Internet
You can now sideload apps on the phone version of Windows 10 — dubbed Windows Mobile — too. Source: Internet