Definitions of crank:

• noun:   a hand tool consisting of a rotating shaft with parallel handle
• noun:   a whimsically eccentric person
• noun:   a bad-tempered person
• noun:   amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
• verb:   bend into the shape of a crank
• verb:   fasten with a crank
• verb:   rotate with a crank
• verb:   start by cranking

  Example: "Crank up the engine"

• verb:   travel along a zigzag path
• adjective:   (used of boats) inclined to heel over easily under sail
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8583)