gna Idiom, Proverb

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gnashing of teeth

anger, complaining When the hospital closed, there was much gnashing of teeth.

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Gnaw your vitals

If something gnaws your vitals, it troubles you greatly and affects you at a very deep level. ('Gnaw at your vitals' is also used.)

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gnash one's teeth

gnash one's teeth
Express a strong emotion, usually rage, as in When Jonah found out he was not going to be promoted, he gnashed his teeth. This expression is actually redundant, since gnash means “to strike the teeth together.” Edmund Spenser used it in The Faerie Queene (1590): “And both did gnash their teeth.” [Late 1500s]

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gnat

gnat
strain at a gnat
to hesitate or have scruples about trifles: Matt. 23:24