cui bono

noun cui bo·no \ˈkwē-ˈbō-(ˌ)nō\

Definition of cui bono

  1. 1 :  a principle that probable responsibility for an act or event lies with one having something to gain

  2. 2 :  usefulness or utility as a principle in estimating the value of an act or policy

Origin and Etymology of cui bono

Latin, to whose advantage?

First Known Use: 1604

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a trip made at another's expense

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