own up to
own up (to something)
To admit or confess (to something). Everyone knows you're responsible, so it will look better if you just own up right now. Tom finally owned up to eating my burrito.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
own up to someone
to confess or admit something to someone. Finally, he owned up to his mother about breaking the vase. We had hoped he would own up to us sooner.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.