Definitions of wrench:

• noun:   a hand tool that is used to hold or twist a nut or bolt
• noun:   a sharp strain on muscles or ligaments

  Example: "The wrench to his knee occurred as he fell"

• noun:   a jerky pulling movement
• verb:   twist or pull violently or suddenly, especially so as to remove (something) from that to which it is attached or from where it originates

  Example: "Wrench a window off its hinges"

• verb:   make a sudden twisting motion
• verb:   twist and compress, as if in pain or anguish
• verb:   twist suddenly so as to sprain

  Example: "Wrench one's ankle"

• name:  A surname (very rare: popularity rank in the U.S.: #24080)