We do not currently know of any antonyms for Cockney rhyming slang.
The noun Cockney rhyming slang is defined as:
A cant used by Cockneys in which a word or phrase is replaced by a rhyming word or phrase, this word or phrase then often being abbreviated to its first syllable or syllables, or its first word. The word chosen as the rhyme often shares attributes of the word that it replaces.
