1. a machine used to separate grain from wheat, rice, or other cereal plants
2. a person who threshes grain
3. a large shark with a very long tail fin that it uses to stun prey
Usage: marine biology

Examples

• The farmer used a thresher to harvest his wheat crop.
• Modern threshers can process hundreds of acres in a single day.
• Before machines, a thresher would beat the grain with a flail.
• The old thresher worked from dawn to dusk during harvest season.
• A thresher shark can grow up to 20 feet long.
• The thresher uses its tail to slap and stun schools of fish.
• We saw a thresher breach the water’s surface near the boat.