A rod/stick to beat somebody with
Definition 1 of 1

Negative Connotation
This phrase usually implies criticism and is often used to point out someone's faults or weaknesses.

Her teammates used her lack of experience as a stick to beat her with.
Metaphorical Use
The 'rod' or 'stick' is not a physical object but a metaphor for rebuke or reprimand.

The auditor's report provided the media with a stick to beat the government with.
Not Literal
Don't confuse this with actual violence. It is a figurative phrase and does not involve physical beating.

His poor performance reviews gave his critics a rod to beat him with.
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