Definition of cui bono? in US English:

cui bono?

exclamation

  • Who stands, or stood, to gain (from a crime, and so might have been responsible for it)?

    • ‘This statement reveals exactly the purpose of the attacks, and answers the question, cui bono.’

Origin

Latin, ‘to whom (is it) a benefit?’.

Pronunciation

cui bono?

/kwē ˈbōnō/