handbrake

Short definition from Wiktionary

Noun

1. 1
   A brake in a vehicle, set by hand, and usually locking on until released by hand, enabling its use when parked.
2. 2
   The mechanism, particularly the locking hand-operated lever or foot-operated toggle lever in a motorcar or the hand-operated crank on a railcar, which is used to set and release such a brake.

Verb

1. 1
   To apply the handbrake in a vehicle.