Last night in his eve of election speech to the Scottish electorate (a vintage performance according to the Guardian), the former UK Prime Minister, Gordon Brown, alluded to a famous line from Macbeth when he said 'Once it's done, it's done', meaning that the result of the election would be permanent, and there would be no going back.
The line in question was Lady Macbeth's remark to her husband, after he had murdered King Duncan 'What's done is done'.
There is a name given to a near quotation of this kind. I don't think it is interpolation. that is slightly different. Can anyone think of the word that is on the tip of my tongue?