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As far as the UK is concerned, 'I could not eat another thing, I am plum full."

This is in reference to the concept of "plumb", i.e. absolutely vertical. Any deviation from plumb is not absolutely vertical.

In this respect, if one is "plumb full" it would imply that that the person is "completely full", with no deviation from the absolute term "full". When you consider a container of fixed volume, it is either full or it is not full so by analogy, "plumb full" would imply that the container (generally the stomach) is full, with no room for any more.

Realistically, the term cannot be completely true since the stomach is somewhat elastic so saying you (or something) is "plumb full" is really just a way to emphasize the fullness.

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8y ago

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