1a handheld device for inking and imprinting a message or design on a surface.
2a person or organization that gives automatic approval or authorization to the decisions of others, without proper consideration:the Commission were accused of being a rubber stamp for the police department
an indication of automatic approval:your application should get the rubber stamp from the residents' association
(rubber-stamp) [with object] approve automatically without proper consideration:parliament merely rubber-stamped the decisions of the party
rubber stamp in other Oxford dictionaries
Definition of rubber stamp in the US English dictionary