red·line  (rěd'līn') 
v.
red·lined, red·lin·ing, red·lines
v.
intr.
To refuse home mortgages or home insurance to areas or neighborhoods deemed poor financial risks. To reach the maximum engine speed at which an engine is designed to be safely operated: The car redlined at 80 miles per hour in fourth gear. Computer Science To mark or highlight edited text, as with a red line, to distinguish it from unedited portions of a document.
v.
tr.
To discriminate against by refusing to grant loans, mortgages, or insurance to. To remove from operational status because of mechanical defects or the need for scheduled maintenance: redlined three fighter aircraft. Computer Science To mark (edited text) by redlining.
n.
or red line
A safety limit, as marked on a gauge. Sports The red line at the center of an ice hockey rink, running parallel to the goal lines and dividing the rink in half. Either of two red lines running across an ice hockey rink near the end boards, in the center of which the goal is positioned.
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