rubber stamp

noun
1.
a device with a rubber printing surface that becomes coated with ink by being pressed on an ink-saturated pad, used for imprinting dates, addresses, standard designations or notices, etc., by hand.
2.
a person or government agency that gives approval automatically or routinely.
3.
such approval.

Origin:
1885–90

Dictionary.com Unabridged

rubber-stamp

[ruhb-er-stamp]
verb (used with object)
1.
to imprint with a rubber stamp.
2.
to give approval automatically or without consideration: to rubber-stamp the president's proposals.
adjective
3.
tending to give approval automatically or without due consideration: a rubber-stamp Congress that passed all the president's bills.

Origin:
1915–20; v. use of rubber stamp

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
rubber stamp
 
n
1.  a device used for imprinting dates or commonly used phrases on forms, invoices, etc
2.  automatic authorization of a payment, proposal, etc, without challenge
3.  a person who makes such automatic authorizations; a cipher or person of little account
 
vb
4.  to imprint (forms, invoices, etc) with a rubber stamp
5.  informal to approve automatically

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

rubber stamp

A person or organization that automatically approves or endorses a policy without assessing its merit; also, such an approval or endorsement. For example, The nominating committee is merely a rubber stamp; they approve anyone the chairman names, or The dean gave his rubber stamp to the recommendations of the tenure committee. This metaphoric term alludes to the rubber printing device used to imprint the same words over and over. [Early 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The notary public's seal shall either be a seal press or a rubber stamp.
However, notaries public may use an embosser seal in addition to the rubber
  stamp.
The use of a rubber stamp of the same size, design and content as that of the
  embossing seal is permissible.
From a practical standpoint, an inked rubber stamp photocopies much more easily
  than a seal impression.
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