open and shut

/ˈoʊpən ən ˈʃʌt/
adjective
  1. Very simple and easy to decide; obvious from the beginning.
    • The detective called it an open-and-shut case because the suspect was caught on camera.
    • Winning the argument was open-and-shut once we saw the contract.
    • For the judge, the evidence made it an open-and-shut matter of fraud.
Antonyms
What does "open and shut" mean? | whatsthatwordmean | whatsthatwordmean