Speaking as if you have a plum in your mouth can help to create the mouth shape necessary for an authentic rp accent Definition of plummy adjective in oxford advanced learner's dictionary It also improves the clarity of your s.
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The meaning of plummy is full of plums
How to use plummy in a sentence
Of, full of, or resembling plums 2 British informal (of speech) having a deep tone and a refined and somewhat.click for more definitions. Ludovic's deferential voice (after what's happened, sir, don't you think it will be more suitable) suddenly turns from its plummy to the plebeian key (to shut your bloody trap).