The idea behind this is that if you stuffed a sock in your mouth, you'd be quiet... so if you tell someone to "put a sock in it", you're telling them to shut up.
意思是如果你的嘴里塞了一只袜子，你就能安静了…所以如果你告诉某人“闭上你的乌鸦嘴”，你就是在让他闭嘴。
youdao
Shut up, keep quiet.
闭嘴，保持安静。
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