shake one's head

shake (one's) head

1. Literally, to rotate one's head back and forth (to the left and to the right) to indicate a negative response, disagreement, or disapproval. When I asked the little girl if she knew where her mommy was, she just shook her head. I see you back there shaking your head no. Is there something you disagree with?
2. To express confusion or bewilderment about something that has just happened or been revealed. This usage does not always indicate a literal movement of the head. When he abruptly exited the meeting without explanation, we all just sat there shaking our heads. Just shaking my head right now. What was that all about?
See also: head, shake
Farlex Dictionary of Idioms.

shake one's head

Express disapproval, dissent, or doubt, as in That announcement had us shaking our heads in dismay. This expression, which can be used both literally (for moving one's head from side to side) and figuratively, dates from about 1300.
See also: head, shake
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • shake (one's) head
  • shake your head
  • shake (one's) head no
  • vote with (one's) feet
  • vote with feet
  • vote with one’s feet
  • vote with one's feet
  • vote with your feet
  • in (one's) bad graces
  • in someone's bad graces
References in periodicals archive
So once again, one can only shake one's head in frustration at the inability of North Walians to access all its potential delights.
Chamberlain's impression and shake one's head about such naivety.
But to shake one's head in disgust and then forget about it would be unforgiveable.
Today, it is too often replaced with rancor, bile and hate and an ignorance so profound that one can only shake one's head in disbelief and wonder how relations will ever improve.
In one sense, it's hard not to shake one's head at the Bush administration's rejection, on grounds that it's excessive, of Sen.
King's reminder that it isn't always enough to shake one's head at injustice."