gnash

[nash]
verb (used with object)
1.
to grind or strike (the teeth) together, especially in rage or pain.
2.
to bite with grinding teeth.
verb (used without object)
3.
to gnash the teeth.
noun
4.
an act of gnashing.

Origin:
1490–1500; variant of obsolete gnast, Middle English gnasten; compare Old Norse gnastan gnashing of teeth

gnashingly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
gnash (næʃ)
 
vb
1.  to grind (the teeth) together, as in pain or anger
2.  (tr) to bite or chew as by grinding the teeth
 
n
3.  the act of gnashing the teeth
 
[C15: probably of Scandinavian origin; compare Old Norse gnastan gnashing of teeth, gnesta to clatter]
 
'gnashingly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

gnash
1496, variant of M.E. gnasten "to gnash the teeth" (c.1300), perhaps from O.N. gnastan "a gnashing," of unknown origin, probably imitative.
Online Etymology Dictionary, © 2010 Douglas Harper
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Easton
Bible Dictionary

Gnash definition


Heb. harak, meaning "to grate the teeth", (Job 16:9; Ps. 112:10; Lam. 2:16), denotes rage or sorrow. (See also Acts 7:54; Mark 9:18.)

Easton's 1897 Bible Dictionary
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Example sentences
Faculty members gnash their teeth and wring their hands when students plagiarize.
Obviously, an unexpected expense or repair will cause buyers to gnash their teeth and lament.
Big, noisy and extremely hip, it will make traditionalists gnash their teeth.
Farther afield, editors seemed to gnash their teeth at scant and conflicting reports.
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