A handle or arm attached at right angles to a shaft, used to turn it. He used the crank to start the old engine.
An eccentric or odd person, especially one who is obsessed with a particular subject. The town's resident crank was known for his unusual theories about aliens.
A part of an axle or shaft bent out at right angles, for converting reciprocal to circular motion and vice versa. The bicycle's pedal is connected to the wheel through a crank.
Methamphetamine; an illicit stimulant drug (slang). He was arrested for selling crank on the street.