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becoming worse or more difficult, as if by analogy to a trend line.
* Moot point in British English has historically meant a point that is worth debating, but the meaning is shifting towards that in US English, where it can mean a trivial point, or even an irrelevant point (ironically not worth debating).
* "Steep learning curve" was used in psychology from the 1920s to describe the quick and easy acquisition of skill;

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