Definition of "gnash" []

• To grind or strike (the teeth, for example) together. (verb-transitive)
• To bite (something) by grinding the teeth. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Even standalone flashplayers like "gnash" can't even play these files."
• "Sweat beaded over his skin, and he had to gnash his teeth to keep them from chattering."
• "Sometimes I tear at my hair and gnash my teeth over producing the content, but knowing that people like you appreciate my hard work goes a long way."