Fred Astaire vs Tony Blair

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Rhyming slang is a form of English slang in which a word is replaced by a rhyming word, typically the second word of a two-word phrase (so stairs becomes “apples and pears”, feet “Plate of meat”, etc)
People used to say “Fred Astaire” for “hair”, but here you go, as time goes by, the younger generation doesn’t know who the hell that Fred is, and tends to use “Tony blair” instead.