redline

noun

the maximum safe speed, power, etc. of an engine, usually indicated by a red line or mark on a gauge, as a tachometer

intransitive verb -·lined′, -·lin′·ing

to attain the maximum safe speed, power, etc. a car that redlines at 7,500 rpm

transitive verb -·lined′, -·lin′·ing

to refuse to provide loans or insurance in (a neighborhood) by redlining