horse power
noun[CorU]
MEASURES(alsohorsepower)ukuspluralhorse power(abbreviationhp)aunitused formeasuringthepowerof anengine:
Horsepowerratestheengineperformanceofcarsandevenlawnmowers.
With a 520 horsepower, V12engine, this is thefastestcarthecompanyhasevermade.