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gnash

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The definition of gnash is to grind the teeth in pain or anger.

(verb)

When your child disobeys you for the millionth time and you are filled with great anger and you grind your teeth together in frustration, this is an example of gnash.

See gnash in Webster's New World College Dictionary

transitive verb

to grind or strike (the teeth) together, as in anger or pain
to bite by grinding the teeth

Origin: Early ModE for earlier gnast < ME gnasten, prob. < ON gnīsta, to gnash (the teeth), gnastan, to gnash, prob. > IE *ghnei- < base *ghen- > gnaw

intransitive verb

to grind the teeth together

noun

the act of gnashing

See gnash in American Heritage Dictionary 4

transitive verb gnashed, gnash·ing, gnash·es