Does Apple watch vibrate on silent mode?

“Silent mode” means your watch will not chime or beep but will vibrate. All other functions work normally. Turn it on and off by tapping the bell icon. “Theater mode” puts your phone into silent mode and also turns off the display, unless you tap it or press a button.

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How do I turn on vibrate only mode?

To have your phone vibrate only (not make sounds), press and hold the volume down button until your phone vibrates.