If you wrench something that is fixed in a particular position, you pull or twist it violently, in order to move or remove it.

If you wrench yourself free from someone who is holding you, you get away from them by suddenly twisting the part of your body that is being held.

If you wrench one of your joints, you twist it and injure it.

If you say that leaving someone or something is a wrench, you feel very sad about it.

A wrench or a monkey wrench is an adjustable metal tool used for tightening or loosening metal nuts of different sizes.

If someone throws a wrench or throws a monkey wrench into a process, they prevent something happening smoothly by deliberately causing a problem.