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redlining 

Running a piece of equipment, most often an engine or other powerplant, way beyond it's rated maximum, usually in an emergency situation.

Usually, denoted by taking the engine revs or temperature up into the red area on an indicator dial, risking permanent damage or catastrophic failure.
"How fast will that thing go ?"

"One fifty five, but after one forty you'll be redlining"
redlining by Eighth of Seven January 8, 2007
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redlining 

In broadcasting or sound engineering, redlining is when the levels are set too high and the lines on the screen/board are in the red instead of the more desired orange or yellow. Leaving levels at this high level may cause your audio to sound distorted and unpleasant.
Dude, your levels are up too high, you're redlining!
redlining by nacht_for_haters September 16, 2018

Redlining 

When your car makes a funny noise to tell you that your need to shift gears or the engine will fucking explode
Dudebro: yeah bruh I was redlining in my 2008 camry and the engine blew up what I do my parents are gonna kill me
Redlining by ZenMaster69 June 19, 2020

redlining 

From redline -
Pronunciation: 'red-'lIn
Function : verb
: redline, to redline, also redlining; to engage in sexual intercourse at an extremely rapid tempo.

Origin in redline : a recommended safety limit; the fastest, farthest, or highest point or degree considered safe.
Hank said he was redlining that bitch for an hour.

After redlining that bitch, she could barely walk.
redlining by Ciao [Scum Crew] April 22, 2006

redlining 

when a girl has her period.
no sex tonight, ash is redlining.
redlining by dale'n'ry February 19, 2010

Redlining 

This term is used for have sex
It was so amazing they way she was Redlining me last night
Redlining by Arsinal December 19, 2009

Redlining 

He used all of the cocaine he bought last night Redlining his girlfriend.
Redlining by Darren The Great November 1, 2023