Google define genuflect you will got a 'mentions graph' of genuflect. It's very interesting that the graph is very steep while graph of other words, run for example, are very smooth. Any idea why this happens?
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Mitch's point in the comments is most likely the explanation. "genuflect" is used much less often than a word like "run" and if you plot them together, the "genuflect" usage is a flat line at the bottom of the scale.
So the basic answer is that any line with enough data points will be smoothed by Google's graphic software to look like it does in the plot for "run". "Genuflect" will not receive the same treatment because there aren't enough data points.