top of the line

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.

cherry on top

Synonym of icing on the cake (“a thing which intensifies the appreciation of something already good, or (ironic) the regretting of something already bad”).

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.