Being sure has to do with being certain, convinced, trustworthy, or dependable. You can trust a sure thing.
Besides being a synonym for yes, sure has to do with lots of kinds of dependability. If you have a sure eye, then you have good aim, maybe with shooting a basketball or throwing darts. If you're sure of yourself, you're confident. A sure thing or sure bet is something almost certain to happen. If you're 100% convinced of something, you're sure of it.
1 |
adjadv |
having or feeling no doubt or uncertainty; confident and assured
definitely or positively (`sure' is sometimes used informally for `surely')
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2 |
adj |
reliable in operation or effect
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3 |
adj |
exercising or taking care great enough to bring assurance
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