What does shaking head mean?

摇头是什么意思？

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The head of the EU observer team, Phillippe Morillon, says that in the mean time, the Karzai campaign should refrain from declaring victory.

VOA: standard.2009.09.16

He doesn't literally mean even that when we talk to ourselves somebody pats us on the head " and says, "Good man. Perfect. I'm very proud."

他更不是在说,当我们自言自语时,会有人拍拍我们的头,说“做的好，非常棒，我为你自豪“

耶鲁公开课 - 心理学导论课程节选

But they were bandaged head to foot, man, and I mean head to foot.

NEWYORKER: Beginners

This would not require an increase in funding, he added, as it would mean head teachers could choose how to spend their allotted examinations budget.

BBC: Tories plan archive of past exams

So what could well head freeze off mean to gas supplies?

FORBES: Cold Spell Freezes Gas Wells