put the finger on someone

put the finger on (one)

To identify and accuse one of doing something; to inform on one to an authority figure. Don't you dare put the finger on me! I had nothing to do with the deal going sour. I fear my life is in danger now that I've put the finger on the mob boss.
See also: finger, on, put
Farlex Dictionary of Idioms.

put the finger on someone

If you put the finger on someone, you tell someone in authority that they have done something wrong or blame them for something bad. A lot of people will point to the defeat and put the finger on the head coach. Their report put the finger on diesel pollution.
See also: finger, on, put, someone
Collins COBUILD Idioms Dictionary, 3rd ed.

put the finger on someone

tv. to identify someone (for someone else, such as the police). (Underworld.) Tyrone put the finger on the killer, then got out of town fast.
See also: finger, on, put, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • (one) could use (something)
  • drive (one) out of office
  • force (one) out of office
  • force out of office
  • give (one) (one's) head
  • give head
  • give somebody their head
  • give someone their head
  • cooking for one
  • as one door closes, another (one) opens