Definition of the devil is in the details in US English:

the devil is in the details

phrase

  • The details of a matter are its most problematic aspect.

    • ‘Well, again, Susan, the key here is the devil is in the details.’
    • ‘This sounds like we could be going in the right direction at last, but, as ever, the devil's in the detail.’
    • ‘She also welcomes the government's package, but she says the devil's in the detail.’
    • ‘To use a common expression ‘the devil is in the detail’.’
    • ‘Beware, the devil's in the detail - set out the facts as clearly as possible and keep your letter short and to the point.’
    • ‘As Sian Flynn explains, the devil's in the detail.’
    • ‘Once you think you've found the right match, the devil is in the details.’
    • ‘This is fraught with difficulties because the devil will be in the detail of the new contract due to be negotiated with the IHCA.’
    • ‘But the devil's in the detail - Sky has won four new live packages, which include live games on Saturday lunchtime and Saturday afternoons.’
    • ‘While welcoming the support, the fishing industry's president says the devil's in the detail, but $10 million is not enough.’