A minnow is a small freshwater fish, usually just a few inches long, that swims in streams, ponds, and lakes. If you've ever waded in a creek and seen tiny silvery fish darting between the rocks, you were probably watching minnows. They travel in groups called schools, moving together like a coordinated underwater dance team.

Fishermen often use minnows as bait because larger fish like bass and pike love to eat them. In fact, minnows sit near the bottom of the food chain in most waterways, which means many bigger creatures depend on them for food. Despite being small and seemingly defenseless, minnows play a crucial role in keeping their ecosystems healthy.

The word also describes anything small compared to others of its type. A startup company might be called a minnow compared to giant corporations. A small-town soccer team facing a championship squad could be considered a minnow in the tournament. When used this way, minnow suggests something or someone that seems outmatched but might surprise everyone. After all, minnows may be tiny, but they're survivors who've thrived in waters around the world for millions of years.