surefire ne demek?

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Sura.
In a sure manner; safely; certainly.
Certainly knowing and believing; confident beyond doubt; implicity trusting; unquestioning; positive.
Physically secure or dependable; 'a sure footing'; 'was on sure ground' certain not to fail; 'a sure hand on the throttle' infallible or unfailing; 'a sure sign of one's commitment' worthy of trust or confidence; 'a sure friend'.
Certain to find or retain; as, to be sure of game; to be sure of success; to be sure of life or health.
Definitely or positively ; 'the results are surely encouraging'; 'she certainly is a hard worker'; 'it's going to be a good day for sure'; 'they are coming, for certain'; 'they thought he had been killed sure enough'; 'he'll win sure as shooting'; 'they sure smell good'; 'sure he'll come'.
Fit or worthy to be depended on; certain not to fail or disappoint expectation; unfailing; strong; permanent; enduring.