1. To remove or take away someone or something by pulling or prying in a violent, wrenching manner. A noun or pronoun is used between "wrench" and "out." He wrenched the gun out of the attacker's hands. I managed to wrench the iron bar out of the cement before it had set completely.
2. To obtain or extract something, such as information, from someone or something, especially after much difficulty or persistence. We were finally able to wrench some answers out of the spy we were interrogating. I've never been able to wrench any meaning out of abstract paintings—they always look just like splatters of paint to me. I wrenched out a confession from Tommy after threatening to take his video games away for a year.