put one's mind to
Also, set one's mind on. Concentrate on or be determined to achieve, as in She's put her mind to improving her test results, or I've set my mind on finding a job I really like. [First half of 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.