to blame, be
Be responsible for or guilty of something wrong or bad, as in Obviously the teacher was to blame for the chaos in the classroom, or Mary was not to blame for these errors. [Early 1200s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.