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English definition of “rubber stamp”

rubber stamp

noun [C]    /ˈrʌb·ər ˈstæmp/
a device used for printing with raised letters, numbers, or pictures made of an elastic substance such as rubber that you cover with ink and press against a surface, or the printed letters, etc., made in this way: The guard marked my pass with a rubber stamp. disapproving A rubber stamp is also an approval given without much thought: The mayor has a lot of power, and city counselors provide a rubber stamp.
(Definition of rubber stamp noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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