[point] the finger at {sb}

to blame someone or hold them accountable for something bad that has happened

The idiom "point the finger at someone" originates from the human gesture of physically indicating someone or something with one's finger. In a figurative sense, it is used to accuse or assign blame to a particular person for a wrongdoing or problem.

Let's stop pointing fingers at each other and just solve the problem!
During the investigation, they were quick to point the finger at the new employee, but further evidence cleared her of any involvement.
It's not fair to point the finger at one person for the project's failure; it was a collective effort, and we all share responsibility.
In a court of law, it's crucial to have concrete evidence before you can point the finger at a suspect.
The media often points the finger at celebrities for societal issues, even when they may not be directly responsible.