Sometimes you just draw the line, or draw a line, and that marks a boundary that must not be gone past, for wahtever reason.
Perhaps someone is taking things so far, and so you draw a line under it.
Whatever the reason, the origin is that good old thing that is sport.
Specifically it would seem to be tennis or generic net requiring games in the past, where the players would need to have the dimensions clearly marked, in other words, they needed to draw a line to represent the dimensions of the court.
And so that is the origin of the phrase to draw the line or to draw a line - from tennis, and clearly from there it entered the general vocabulary as a good way of setting boundaries of one sort or another.Back to Phrase Finder
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