redline
verb
[ ˈrɛdlʌɪn ]
• drive with (a car engine) at or above its rated maximum revolutions per minute.
• "both his engines were redlined now"
• refuse (a loan or insurance) to someone because they live in an area deemed to be a poor financial risk.
• "banks have redlined loans to buyers"
redline
noun
• the maximum number of revolutions per minute for a car engine.
• "just over halfway to its 5200 rpm redline"
• a boundary or limit which should not be crossed.
Origin:
from the use of red as a limit marker, in redline (sense 2 of the verb) a limit marked out by ringing a section of a map.
