hold the line

apron-string hold

An estate held by a man during his wife's life.

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.

buy and hold

A passive investment strategy where an investor purchases an asset and retains it for many years, rather than trading it frequently.

cross the line

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

don't hold your breath

Don't wait. Said cynically to suggest that what has just been mentioned is unlikely to happen soon or at all.