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Round and round the garden like a teddy bear Rub someone's nose in it Rub your nose in it Rule with an iron fist Sans teeth, sans eyes, ...
A "roll of the tongue" is what is above
But also if you say that a word or a sentence just rolls off your tongue then it means that it comes out very easily. In italian you could express this as
parlare a lingua sciolta
if it gives you the idea