To take someone or something away from someone or something by pulling or prying in a violent, wrenching manner. A noun or pronoun is used between "wrench" and "off." He walked over to the headstone and wrenched off the medallion that had been embedded in the marble. The man has been hailed as a hero for wrenching the gun off of the shooter before anyone was harmed. The officers wrenched my son off me before I had the chance to run.