English rendering seethe inwardly Literal translation: “grind the inner teeth”
To feel extremely resentful inwardly.
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Writing text속니 갈다
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grit one’s teeth To show firm determination by clenching one’s teeth to endure pain, anger, or the like. 
Be consumed by anger Become so angry or unable to contain one's fury that malicious resolve arises. 
Shared · 2 be furious or utterly fed up To feel unbearably angry or thoroughly sick of something. 
2 meanings Be chipped or incomplete For part of a vessel’s rim or a blade’s edge to break off 
Be nowhere near ready Have an inadequate level or degree of preparation for undertaking something 
Have no effect at all Elicit no response or acceptance, whatever one says or does. 
Gnash one's teeth in anger Resolve bitterly and await revenge, overcome by anger or indignation. 
seethe with anger or disgust To feel extremely angry or thoroughly sick of something. 
2 meanings grit one’s teeth To make an extraordinary resolution to overcome a difficulty or obstacle beyond one’s strength. 
2 meanings Shared · 2 shoot one’s mouth off Coarsely, to tell others facts or matters one knows. Browse in Hangul order.
WORDROW Korean Idioms