show of hands

noun
an indication of approval, disapproval, volunteering, etc., on the part of a group of persons, usually made by each assenting person raising his or her hand.
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World English Dictionary
show of hands
 
n
the raising of hands to indicate voting for or against a proposition

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

show of hands

An informal vote made by participants holding up one hand each to indicate a choice, as in Let's have a show of handshow many want the next meeting on a Sunday? [Late 1700s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Perhaps a show of hands is the scientific way today.
The meeting is again open to everyone, and the voting is also open, by show of
  hands.
Ask for a show of hands for those students who accurately predicted the story
  topic based on the vocabulary.
The show of hands up are sufficient for the voting process and if hands are not
  shown, they will be cut off.
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