se taire means nothing but to silence one's self (shut up). Even high school students are taught that taisez-vous means SHUT UP!.
Wow. I never cease to be amazed.
I'll go you one farther. My daughter is in the 8th grade, doesn't take French, but has several friends who do. I called her in the study and asked her if she knew what taisez-vous meant?
She thought for about a half a second, then said
Shut up!!!!