take a firm grip on

take a firm grip on someone or something

 
1. Lit. to grasp someone or something tightly. The police officer took a firm grip on Fred and led him to the squad car. Mary took a firm grip on the handle and pulled hard.
2. Fig. to gain control of someone or something. You will have to take a firm grip on Andrew. He has a mind of his own. Someone needs to take a firm grip on this department and get it organized.
See also: firm, grip, on, take