You never know Definition 1 of 2Pro Tip 1/3Expect the Unexpected Indicates that outcomes are never guaranteed, and surprises can occur. We should study all the material, you never know what the exam will include. Pro Tip 2/3Colloquial Use Commonly used in informal situations or everyday conversations. Are you going to the party? I wasn't invited, but you never know. Pro Tip 3/3Subtle Encouragement Can imply a hint of optimism or hope in unsure situations. I don't think I'll win the lottery, but you never know.