A line indicating the general course or tendency of something, e.g., a geographical feature or a set of points on a graph.
- I certainly hope the general trend line is upward.
- In that chart is also drawn a line that represents the trend line for the weekly change in central bank holdings, using the right axis.
- The data are not all rosy, of course; but the trend line is good, at the moment, for the Republicans.
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