a tool consisting of a solid head, usually of metal, set crosswise on a handle, used for beating metals, driving nails, etc.
any of various instruments or devices resembling this in form, action, or use, as a gavel, a mallet for playing the xylophone, or a lever that strikes the bell in a doorbell.
Firearms. the part of a lock that by its fall or action causes the discharge, as by exploding the percussion cap or striking the primer or firing pin; the cock.
one of the padded levers by which the strings of a piano are struck.
Track. a metal ball, usually weighing 16 pounds (7.3 kg), attached to a steel wire at the end of which is a grip, for throwing for distance in the hammer throw.
Anatomy. the malleus.
verb (used with object)
to beat or drive (a nail, peg, etc.) with a hammer.
to fasten by using hammer and nails; nail (often followed by down, up, etc.): We spent the day hammering up announcements on fences and trees.
to assemble or build with a hammer and nails (often followed by together ): He hammered together a small crate.
to shape or ornament (metal or a metal object) by controlled and repeated blows of a hammer; beat out: to hammer brass; to hammer a brass bowl.
to form, construct, or make with or as if with a hammer; build by repeated, vigorous, or strenuous effort (often followed by out or together ): to hammer out an agreement; to hammer together a plot.
to produce with or by force (often followed by out ): to hammer out a tune on the piano; to hammer a home run.
to pound or hit forcefully: to hammer someone in the jaw.
to settle (a strong disagreement, argument, etc.); bring to an end, as by strenuous or repeated effort (usually followed by out ): They hammered out their differences over a glass of beer.
to present (points in an argument, an idea, etc.) forcefully or compellingly; state strongly, aggressively, and effectively (often followed by home ).
to impress (something) as if by hammer blows: You'll have to hammer the rules into his head.
(in the London stock exchange) to dismiss (a person) from membership because of default.
to depress the price of (a stock).
verb (used without object)
to strike blows with or as if with a hammer.
to make persistent or laborious attempts to finish or perfect something (sometimes followed by away ): He hammered away at his speech for days.
to reiterate; emphasize by repetition (often followed by away ): The teacher hammered away at the multiplication tables.
under the hammer, for sale at public auction: The old estate and all its furnishings went under the hammer.

before 1000; Middle English hamer, Old English hamor; cognate with German Hammer hammer, Old Norse hamarr hammer, crag; orig. made of stone; probably akin to Russian kámen' stone

hammerable, adjective
hammerer, noun
hammerlike, adjective
outhammer, verb (used with object)
rehammer, verb (used with object)
underhammer, noun

12, 13. knock, bang. 13. strike. 14. resolve, solve, thrash, work.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hammer (ˈhæmə)
1.  a hand tool consisting of a heavy usually steel head held transversely on the end of a handle, used for driving in nails, beating metal, etc
2.  any tool or device with a similar function, such as the moving part of a door knocker, the striking head on a bell, etc
3.  a power-driven striking tool, esp one used in forging. A pneumatic hammer delivers a repeated blow from a pneumatic ram, a drop hammer uses the energy of a falling weight
4.  a part of a gunlock that rotates about a fulcrum to strike the primer or percussion cap, either directly or via a firing pin
5.  athletics
 a.  a heavy metal ball attached to a flexible wire: thrown in competitions
 b.  the event or sport of throwing the hammer
6.  an auctioneer's gavel
7.  a device on a piano that is made to strike a string or group of strings causing them to vibrate
8.  anatomy the nontechnical name for malleus
9.  curling the last stone thrown in an end
10.  go under the hammer, come under the hammer to be offered for sale by an auctioneer
11.  hammer and tongs with great effort or energy: fighting hammer and tongs
12.  slang (Austral), (NZ) on someone's hammer
 a.  persistently demanding and critical of someone
 b.  in hot pursuit of someone
vb (often foll by away)
13.  to strike or beat (a nail, wood, etc) with or as if with a hammer
14.  (tr) to shape or fashion with or as if with a hammer
15.  (tr; foll by in or into) to impress or force (facts, ideas, etc) into (someone) through constant repetition
16.  (intr) to feel or sound like hammering: his pulse was hammering
17.  to work at constantly
18.  (Brit) (tr)
 a.  to question in a relentless manner
 b.  to criticize severely
19.  informal to inflict a defeat on
20.  slang (tr) to beat, punish, or chastise
21.  (tr) stock exchange
 a.  to announce the default of (a member)
 b.  to cause prices of (securities, the market, etc) to fall by bearish selling
[Old English hamor; related to Old Norse hamarr crag, Old High German hamar hammer, Old Slavonic kamy stone]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. hamor, from P.Gmc. *khamur. The O.N. cognate hamarr meant "stone, crag" (it's common in Eng. place names), and suggests an original sense of "tool with a stone head," from PIE *komor- "hammer," from base *akm- "sharp (stone)," cf. Slav. kamy, Rus. kameni "stone." The verb is first attested c.1430.
Hammerhead shark is from 1861.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hammer ham·mer (hām'ər)
See malleus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Bible Dictionary

Hammer definition

(1.) Heb. pattish, used by gold-beaters (Isa. 41:7) and by quarry-men (Jer. 23:29). Metaphorically of Babylon (Jer. 50:23) or Nebuchadnezzar. (2.) Heb. makabah, a stone-cutter's mallet (1 Kings 6:7), or of any workman (Judg. 4:21; Isa. 44:12). (3.) Heb. halmuth, a poetical word for a workman's hammer, found only in Judg. 5:26, where it denotes the mallet with which the pins of the tent of the nomad are driven into the ground. (4.) Heb. mappets, rendered "battle-axe" in Jer. 51:20. This was properly a "mace," which is thus described by Rawlinson: "The Assyrian mace was a short, thin weapon, and must either have been made of a very tough wood or (and this is more probable) of metal. It had an ornamented head, which was sometimes very beautifully modelled, and generally a strap or string at the lower end by which it could be grasped with greater firmness."

Easton's 1897 Bible Dictionary
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