noun
a hole in a piece of wood where a branch or knot has been removed
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The carpenter carefully inspected the knothole in the wood before starting to work on the project.
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I peeked through the knothole in the fence to see what was happening next door.
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We found a cool knothole in the tree where we could hide our secret stash.
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She felt like she was always looking at life through a knothole, never fully experiencing everything around her.