"Mute your microphone" is quite standard. Most UIs show a microphone, that you can click on to disable. A circle with a slash through it will appear on top of

"Mute your microphone" is quite standard. Most UIs show a microphone, that you can click on to disable. A circle with a slash through it will appear on top of the picture of the microphone. This is referred to as "muting." This should be enough to see why it is called "muting your microphone." While you could say "disable your microphone," this can lead to confusion, such as thinking that you are talking about more permanently disabling it, such as you do in your computer settings. The most important thing about language is that it is understood. "Mute your microphone" is going to be understood.