"Außer sich" is a German phrase that translates to "beside oneself" in English. It describes a state of extreme emotional agitation, often due to anger, excitement, or distress. When someone is "außer sich," they may lose control over their emotions and behave in ways that are unusual for them. This expression can be used in various contexts, such as when someone receives shocking news or experiences a sudden surge of joy. It highlights the intensity of feelings that can overwhelm a person, making it difficult for them to think clearly or act rationally.