redline

Etymology
, originating with the frequent use of red pen or pencil to mark corrections on drawings and documents (1), and the red markings on a tachometer (2).

Noun

 * 1) A drawing, document, etc. that has been marked for correction or modification.
 * 2) The maximum speed, temperature, pressure, etc., at which a device (such as the engine in a car, aircraft, etc.) is designed to operate.

Verb

 * 1) To mark a drawing or document for correction or modification.
 * 2) To operate a device at one or more redlines.
 * 3)  To run an internal combustion engine to its maximum or maximum recommended speed.
 * 4)  To deny or complicate access to services (such as banking, insurance, or healthcare) to residents in specific, often racially determined, areas.
 * 5)  To achieve audio levels that will cause clipping (indicated by red in an audio meter).
 * 1)  To achieve audio levels that will cause clipping (indicated by red in an audio meter).
 * 1)  To achieve audio levels that will cause clipping (indicated by red in an audio meter).