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trendline

or trend line

[trend-lahyn]
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noun
  1. 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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Origin of trendline

1910–15 for more general sense; trend + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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