Answer: If the root is still attached to a living tree there is not much you can do about it -- because damaging the root will damage the tree. Also, if you cut a living root it will usually grow right back. If it is dead, you can saw it off below grade, trace it along as far as the lawn shows its effect, and saw the other end there. That is the fastest way to get rid of it. Then you would need to patch the lawn. I hope this helps.
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