I accidentally turn voiceover

Hello!

I have done this before myself! No problem! Just open the Watch app on the phone that's connected to the watch, go to Accessibility, tap VoiceOver, and then switch it off.

Hope that helps,

Adin

I assume you want to turn off VoiceOver on your watch. See the 'Use Screen Curtain on your Apple Watch' section in:

Use Screen Curtain with VoiceOver for your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support