a rod/stick to beat somebody with

stick to beat (someone or something) with

Something, often a mishap or misdeed, that is used as an excuse for criticism. Even the slightest mistake by Stan was enough to give the boss a stick to beat him with.
See also: beat, stick
Farlex Dictionary of Idioms.

a rod/stick to ˈbeat somebody with

a fact, an argument, etc. that is used in order to blame or punish somebody: The results of the national exams this year are being used as another stick to beat teachers with.
See also: beat, rod, somebody, stick
Farlex Partner Idioms Dictionary
See also:
  • a stick to beat someone or something with
  • a stick to beat someone with
  • stick to beat (someone or something) with
  • catch (one) dead to rights
  • indict
  • indict for
  • indict for (something)
  • hang (someone) for (something)
  • hang for