thresher

American  

[thresh-er] / ˈθrɛʃ ər /

noun

1. a person or thing that threshes.

2. Also called thresher shark.  Also a large shark of the genus Alopias, especially A. vulpinus, which threshes the water with its long tail to drive together the small fish on which it feeds.

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thresher British  

/ ˈθrɛʃə /

noun

1. a person who threshes

2. short for threshing machine

3. Also called: thrasher.   thresher shark.  any of various large sharks of the genus Alopias, esp A. vulpinus, occurring in tropical and temperate seas: family Alopiidae. They have a very long whiplike tail with which they are thought to round up the small fish on which they feed

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Etymology

Origin of thresher

First recorded in 1350–1400, thresher is from the Middle English word thressher. See thresh, -er ¹

Explanation

A machine or tool used for separating seeds from a grain can be called a thresher. The mechanical thresher was invented in the 18th century. Threshers have simplified the work of agriculture, automating a job that humans once spent tedious hours doing. A combine is an even more efficient machine, combining a thresher and a harvester—it picks the grain and separates its seeds. A scythe is a curved knife used for hand threshing, and the thresher shark gets its name from a resemblance to this tool.

Example Sentences

We’re not talking about a loom, a thresher, or a bolt-turning robot.

From Barron's • Feb. 25, 2026

Its rice was a finicky crop that sprouts slow, skinny and tall, with fewer grains per bunch, and heads that can sag below the reach of the thresher and end up in the mud.

From Los Angeles Times • Aug. 23, 2024

Dr. Porter’s team could tell quite a few tales about what they had to do to obtain thresher shark vertebrae for their study.

From New York Times • Jan. 24, 2024

Results of the study, published in the journal Royal Society Open Science, suggest thresher shark vertebral anatomy and mineralized microstructure meet the demands required for fast swimming and tail-whipping behavior seen in these species.

From Science Daily • Jan. 17, 2024

“Looks like a swordfish and a thresher shark,” says Captain Smith.

From "Blood on the River" by Elisa Carbone