thrasher

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various songbirds of the genus Toxostoma and other genera in the family Mimidae, found throughout the Americas and having a long tail, a long curved beak, and usually a brown head and back.

from The Century Dictionary.

• noun A kind of throstle or thrush; specifically, in the United States, a thrushlike bird of the genus Harporhynchus, of which there are numerous species, related to the mocking-bird, and less nearly to the birds commonly called thrushes.
• noun See thresher.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who, or that which, thrashes grain; a thrashing machine.
• noun (Zoöl.) A large and voracious shark (Alopias vulpes), remarkable for the great length of the upper lobe of its tail, with which it beats, or thrashes, its prey. It is found both upon the American and the European coasts. Called also fox shark, sea ape, sea fox, slasher, swingle-tail, and thrasher shark.
• noun (Zoöl.) A name given to the brown thrush and other allied species. See Brown thrush.
• noun (Zoöl.) See under Sage.
• noun (Zoöl.) the common killer of the Atlantic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who thrashes.
• noun Any of several New World passerine songbirds, of the genera Toxostoma, Allenia, Margarops, Oreoscoptes and Ramphocinclus in the family Mimidae, that have a long, downward-curved beak.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun thrush-like American songbird able to mimic other birdsongs
• noun large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed
• noun a farm machine for separating seeds or grain from the husks and straw