shake one's head

shake one's head idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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