silent apple watch
How to put the Apple Watch silent when the phone rings
Apple Watch Series 3, watchOS 7
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See the 'Mute your Apple Watch' section in:
Change the audio and notification settings on your Apple Watch - Apple Support
"To silence an alert or notification as it sounds, rest your palm on the display for at least three seconds or until you feel a tap. If it doesn't work, see if the Cover to Mute setting is on: On your iPhone, open the Apple Watch app, go to the My Watch tab, then tap Sounds & Haptics."