To winnow means to separate what's valuable from what's worthless by blowing away the lighter, unwanted parts.

The word comes from farming, where people have winnowed grain for thousands of years. After harvesting wheat or rice, farmers toss the grain into the air. The heavier kernels fall back down while the wind blows away the light, papery husks called chaff. What remains is pure grain, ready to become flour or food.

Today we use winnow more broadly to mean narrowing down options by removing what doesn't work. A coach might winnow fifty students trying out for the basketball team down to just twelve players. A scientist winnows through hundreds of theories to find the few worth testing. When you clean your room and decide which old toys to donate, you're winnowing your collection.

The word suggests a smart, deliberate process of elimination. You're not just randomly picking: you're using good judgment to keep what matters and let go of what doesn't. Teachers winnow through stacks of applications to find the best candidates for a special program. Writers winnow their sentences, cutting unnecessary words to make their meaning clearer and stronger.