Definition of "for sure" []

• Definitely, positively, without doubt (phrase)

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• "REally the only way to know for sure if the quality and everything is good is go to a store that has this model in stock and compare it to everything else, then you'll know."
• "That was when I knew for sure that he was seriously depressedthe boy never wore outerwear."
• "However, it is important to note that, while we can achieve these incredible feats of technology, we still do not know for sure whether gravity is a physical force, the bending of space-time, or a property of superstrings that actually creates mass rather than the other way around; and there are additional credible theories about gravity still in contention."