Definitions of crook:

• noun:   a long staff with one end being hook shaped
• noun:   a circular segment of a curve

  Example: "A crook in the path"

• noun:   someone who has committed (or been legally convicted of) a crime
• verb:   bend or cause to bend

  Example: "He crooked his index finger"

• name:  A surname (common: 1 in 16666 families; popularity rank in the U.S.: #2069)