apply oneself to
apply (oneself) to (something)
To put forth effort toward some task or goal. Honey, if you would just apply yourself to your schoolwork, you would get much better grades.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
apply oneself to something
to work hard and diligently at something. You should apply yourself to your studies. She applied herself to her work and the time passed very rapidly.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.