- the maximum rotational speed, or angular velocity, of the engine crankshaft that is considered safe: often measured in rpm.
- a red line or boundary of a red area that delineates such a value, as on a tachometer.
OTHER WORDS FROM redlineredliner, noun
Other definitions for redline (2 of 2)
Origin of red line
How to use redline in a sentence
Former Red Sox star Curt Schilling says his politics are keeping him out of Cooperstown.Conservative Curt Says His Politics, Not His Pitching, Kept Him Out of the Hall of Fame|Ben Jacobs|January 9, 2015|DAILY BEAST
Nor does the jet have the ability to capture high-definition video, utilize an infra-red pointer.
There was deep brown flesh, and bronze flesh, and pallid white flesh, and flesh turned red from the hot sun.Powerful Congressman Writes About ‘Fleshy Breasts’|Asawin Suebsaeng|January 7, 2015|DAILY BEAST
A Republican candidate hoping to win red state support could find a worse team to root for than one from Dallas.
The pale, baby-faced, red-cheeked rapper is furiously puffing away at a hastily-made blunt crammed with low-grade weed.The Cult of Yung Lean: ‘I’m Building An Anarchistic Society From the Ground Up’|Marlow Stern|January 4, 2015|DAILY BEAST
Beginners must be warned against mistaking the edges of cells, or particles which have retained the red stain, for bacilli.A Manual of Clinical Diagnosis|James Campbell Todd
Under the internal pressure his whiskers stood on end and his face grew red.The Bondboy|George W. (George Washington) Ogden
“You appear to feel it so,” rejoined Mr. Pickwick, smiling at the clerk, who was literally red-hot.The Posthumous Papers of the Pickwick Club, v. 2(of 2)|Charles Dickens
Ripperda's eye fell upon the mantle,—it was discoloured a dark red in many places, he nodded his head, and the man withdrew.The Pastor's Fire-side Vol. 3 of 4|Jane Porter
C was a Captain, all covered with lace; D was a drunkard, and had a red face.