Definition of rubber-stamp:
(n) :
(uncountable, countable) Pliable material derived from the sap of the rubber tree; a hydrocarbon biopolymer of isoprene.
(n) :
(uncountable, countable) Natural rubber or any of various synthetic materials with similar properties as natural rubber.
(n) :
(countable, Australia, India, Brunei, New Zealand, UK) An eraser.
(n) :
(countable, Canada, US, slang) A condom, especially an external condom.
(n) :
(Canada, US, in the plural) Water-resistant shoe covers, galoshes, overshoes.
(n) :
(uncountable, slang) Tires, particularly racing tires.