Eggcorn-like something or other

[Laurence Horn]

At 1:09 AM -0500 1/12/06, Rex W. Stocklin wrote:
>Okay this crowd is WAY too fast for me, even if Colbert ain't, but
>just today the neato lady who came over and installed my CPAP machine
>(sigh...) uttered this:
>
>They had determined from the underlining cause that she needed therapy.
>
When I mentioned my previously cited "undermind" (for "undermine") to
a friend off-list, she mentioned that it reminded her of encountering
"underlining", as in "underlining representation" in students'
homework assignments.

larry