noun
1. : a stamp of rubber for making imprints
2.
a. : a person who echoes the words, opinions, or mannerisms of others : one without originality
b. : a group (as a legislative body) or a person that approves or endorses a program or policy with little or no dissent or discussion
it is probably not fair to consider the council merely a rubber stamp — F.A.Ogg & Harold Zink
others have been more amenable rubber stamps for administration policy — Economist
3.
a. : something (as an expression) that duplicates without originality a common mode or pattern : stereotype , cliché
the usual rubber stamps of criticism — H.L.Mencken
your windows can be … rich without being rubber stamp — American Home
b. : an endorsement or approval especially when given with slight study or discussion