A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems, usually on heavy vehicles. Retarders serve to slow vehicles, or maintain a steady speed while traveling down a hill, and help prevent the vehicle from "running away" by accelerating down the hill. They are not usually capable of bringing vehicles to a standstill, as their effectiveness diminishes as vehicle speed lowers. They are usually used as an additional "assistance" to slow vehicles, with the final braking done by a conventional friction braking system. As the friction brake will be used less, particularly at higher speeds, their service life is increased, and since in those vehicles the brakes are air-actuated helps to conserve air pressure too.
Friction-based braking systems are susceptible to "brake fade" when used extensively for continuous periods, which can be dangerous if braking performance drops below what is required to stop the vehicle – for instance if a truck or bus is descending a long decline. For this reason, such heavy vehicles are frequently fitted with a supplementary system that is not friction-based.
Retarders are not restricted to road motor vehicles, but may also be used in railway systems. The British prototype Advanced Passenger Train (APT) used hydraulic retarders to allow the high-speed train to stop in the same distance as standard lower speed trains, as a pure friction-based system was not viable.
Friction-based braking systems are susceptible to "brake fade" when used extensively for continuous periods, which can be dangerous if braking performance drops below what is required to stop the vehicle – for instance if a truck or bus is descending a long decline. For this reason, such heavy vehicles are frequently fitted with a supplementary system that is not friction-based.
Retarders are not restricted to road motor vehicles, but may also be used in railway systems. The British prototype Advanced Passenger Train (APT) used hydraulic retarders to allow the high-speed train to stop in the same distance as standard lower speed trains, as a pure friction-based system was not viable.
by Huvudpersson July 24, 2017
Get the Retardermug. by Grandepapa November 7, 2022
Get the Retardmug. by jerryaayyyy March 8, 2009
Get the jumping retardmug. by lilleluderpik March 10, 2023
Get the Retardismmug. 
When sexual intercourse is performed by the Dom/Top so well the Sub/Bottom starts to lose control of their muscles, thoughts and motor functions. They start losing their mind and aren’t even able to perform a normal sentence. They start losing the ability to use their other 4 senses from the unbearable pleasure and left spent, exhausted, physically drained and satisfied to, and beyond the point they expected or wanted and hardly able to walk if at all. Likely needing a wheelchair
Side note: the Dom could be man or woman. But it’s usually a man.
Side note: the Dom could be man or woman. But it’s usually a man.
Michael lured her in and fucked the poor woman retarded. She had to take time off work to recover.
I got fucked retarded by Jennifer a few weeks ago, I was so drained I missed the next few basketball games so I could gain back my strength.
I got fucked retarded by Jennifer a few weeks ago, I was so drained I missed the next few basketball games so I could gain back my strength.
by Anonymous 20000000000000 February 5, 2022
Get the Fucked Retardedmug. A mental health condition whose primary symptom is a compulsion to post massive numbers of definitions beginning with "Extraphysical".
by lnjwzqhi June 17, 2022
Get the Extraphysical Retardationmug.