redline

(US, Canada) To deny or complicate access to services (such as banking, insurance, or healthcare) to residents in specific, often racially determined, areas.

To operate a device at one or more redlines.

To run an internal combustion engine to its maximum or maximum recommended speed.

To achieve audio levels that will cause clipping (indicated by red in an audio meter).

To mark a drawing or document for correction or modification.

The maximum speed, temperature, pressure, etc., at which a device (such as the engine in a car, aircraft, etc.) is designed to operate.

A drawing, document, etc. that has been marked for correction or modification.