open and shut
[adjective]
Synonyms: clear, apparent, distinct, evident, manifest, obvious, palpable, patent, plain, straightforward

[TahlilGaran] English Synonym Dictionary ▲

open-and-shut /ˌəʊ.p^ən.ənˈʃʌt/ US /ˌoʊ-/
adjective
describes a problem or legal matter which is easy to prove or answer:
Our lawyer thinks that we have an open-and-shut case.

[TahlilGaran] Advanced Learner's Dictionary ▲

open and shut
if a legal case or problem is open and shut, the facts are very clear and it is easy to make a decision or find a solution.
The police think the case is open and shut: five witnesses saw the man stealing the car.

It's going to take a lot of work to deal with this problem. It certainly isn't an open-and-shut matter.

[TahlilGaran] English Idioms Dictionary ▲

open and shut
See: CUT AND DRIED.

[TahlilGaran] English Idioms Dictionary ▲