to blame, be

be to blame

To be the cause of something harmful or unpleasant. I heard that slippery roads were to blame for the accident here this morning.
See also: blame
Farlex Dictionary of Idioms.

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® Dictionary of Idioms by Christine Ammer.
See also:
  • be to blame
  • to blame
  • place the blame for (something) on (someone or something)
  • place the blame on (someone or something) for (something)
  • the finger of blame
  • lay the blame on
  • lay the blame on (one)
  • place the blame on
  • place the blame on (someone or something)
  • put the blame on