Power can be murder to resist.
This is the tagline of the novel and film The Firm.
What does it mean for something to "be murder to resist"?
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this is idiomatic and it means "Power can be very difficult to resist", which in turn means "When offered power, it can be very difficult to refuse to take it." 'Power' in this context means having influence over someone or something, rather than electrical power etc.
The film also involves the crime of murder, so there is a play on words. Presumable the taking and exercise of power involves murder.