trendline

[ trend-lahyn ]

/ ˈtrɛndˌlaɪn /

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noun

an upward or downward line on a chart indicating movements of average prices, as of stocks, over a period of time.

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The rainy weather could not ________ my elated spirits on my graduation day.

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Origin of trendline

1910–15 for more general sense; trend + line¹

We have already seen where that leads us—take a look at the trendline of recording sales, if you have any doubts.
Music Criticism Has Degenerated Into Lifestyle Reporting|Ted Gioia|March 18, 2014|DAILY BEAST
One way of answering the question is to look at trendline growth in GDP compared to the anticipated size of any looming recession.
It Didn't Work In Japan and It Won't Here Either|Paul Kedrosky|October 21, 2008|DAILY BEAST