To overestimate means to judge something as larger, better, stronger, or more important than it really is. When you overestimate how much time you have before the bus arrives, you might think you have ten minutes when you actually have only five. When a coach overestimates their team's abilities, they might schedule matches against opponents who are far too skilled, leading to lopsided defeats.

We often overestimate our own capabilities. A student might overestimate how quickly they can finish a book report, planning to do it all Sunday night when it really needs a full week. Someone learning to ride a bike might overestimate their balance and try tricks before mastering the basics.

The opposite is underestimate, when you judge something as less than it is. If you underestimate a math test's difficulty, you might not study enough. Both mistakes lead to problems, but overestimating usually means you end up unprepared or disappointed when reality doesn't match your expectations.

The trick is developing good judgment through experience. After overestimating a few times, you start to recognize patterns and make more accurate predictions about what you can actually accomplish.