a grip on
a grip on (oneself)
Control of one's reactions or emotions. After losing her job, Sarah 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.
a grip on (something)
1. A good physical hold on something. In order to remove the bolt, I needed to get a grip on the wrench.
grip on (something)
2. A newfound understanding of a topic or concept. The teacher spent extra time going over the material in class because she wanted her students to have a good grip on the subject matter before they took the exam.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*a grip on something
1. and *a hold on something Lit. a good grasp on something. (*Typically: get ~ have ~ give someone ~.) Try to get a grip on the ropes and pull yourself up. You should get a hold on the knob and turn it firmly.
2. Fig. a thorough knowledge of some topic. (*Typically: get ~ have ~ give someone ~.) I need to have a grip on the basics of accounting. Try to get a hold on all the facts first.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.