To *solve* something is to find a solution, like figuring out the answer to a complex riddle.

The verb *solve* is often used in mathematics, and it means to answer a math problem. You can solve other, non-mathematical problems too — like the question of what to wear when you've run out of clean clothes (your sibling's clothes!). The word *solve* originally came from the Latin *solvere*, which meant "to loosen or untie." If you think of any kind of complex problem as a knot, then the original definition of *solve* still makes sense!