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gnarl (EN)
verb, noun

verb “gnarl”

infinitive gnarl; he gnarls; past tense gnarled; past part. gnarled; ger. gnarling
  1. to twist or make something knotted
    The old tree's roots gnarled around the rocks.

noun “gnarl”

singular gnarl, plural gnarls
  1. a hard, twisted bump on a tree
    The old oak tree had a large gnarl on its trunk where the branches twisted together.