One of these days Definition 1 of 2Pro Tip 1/3Non-specific Future Indicates a future event without giving a precise time. I'll visit Paris one of these days, when I get vacation time. Pro Tip 2/3Casual Intent Shows casual or informal intention, often used among friends. Let's catch up one of these days over coffee. Pro Tip 3/3Optimistic Tone Expresses hope or optimism regarding the future. One of these days, we'll look back at this and laugh.