noun
a knotty protuberance on a tree or in wood
verb
to twist or distort, especially with a contorted or knotted appearance
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The gnarl in the tree trunk indicated its age and resilience.
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I tripped over a gnarl in the sidewalk and nearly fell.
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That skateboarder pulled off an impressive trick on the gnarl in the park.
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The gnarl of emotions within her made it difficult to express how she truly felt.