rhyming slang - definition and synonyms

noun [uncountable] British 

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/ˌraɪmɪŋ ˈslæŋ/
  1. a way of talking in which you replace the normal word for something with a word or phrase that rhymes with it. An example is ‘dog and boneinstead of ‘phone’. Rhyming slang is used especially by Cockneys (=people from East London).