sponge rubbernoun [ U ]uk /ˌspʌndʒ ˈrʌb.ər/ us /ˌspʌndʒ ˈrʌb.ɚ/ US
› → foam rubber
(Definition of “sponge rubber” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to touch with your lips, especially as a greeting, or to press your mouth onto another person's mouth in a sexual way