Meaning of “pin sth on sb” - Learner’s Dictionary

pin sth on sb

informal phrasal verb with pin uk us /pɪn/ verb [ T ] (present participle pinning, past tense and past participle pinned)

to blame someone for something they did not do:

They tried to pin the murder on the dead woman's husband.

(Definition of “pin sth on sb” from the Cambridge Learner’s Dictionary © Cambridge University Press)