get a grip on

get a grip on (oneself)

To control one's reactions or emotions, especially during or after a stressful situation. After losing her job, Jill needed to calm down and get a grip on herself in order to drive home safely. You're not going to be able to think clearly until you get a grip on yourself.
See also: get, grip, on

get a grip on

Also, have a grip on. Obtain mastery or control over something or someone. For example, Get a grip on yourself or the reporters will give you a hard time, or, as Arthur Conan Doyle put it in Sherlock Holmes (1894): "I have a grip on the essential facts of the case." This expression transfers a firm physical hold to emotional or intellectual control. [Late 1800s]
See also: get, grip, on