lead the line

all roads lead to Rome

Different paths can take one to the same goal.

blur the line

To minimize or erode the distinction between two things.

bottom line

The summary or result; the most important information.

bottom of the line

The worst or lowest quality on the market, especially among a range of products.

bright line

A clear distinction in the context of a legal, moral, ethical, or analytical judgment.

cross the line

To overstep a boundary, rule, or limit; to go too far or do something unacceptable.

draw a line

To delimit a boundary or border.

draw the line

To set a boundary, rule, or limit, especially on what one will tolerate.