As I looked among the stems of the trees and followed the discoloured marks in the snow where the thaw was sinking into it and undermining it, I thought of the motherly face brightly set off by daughters that had just now welcomed me and of MY mother lying down in such a wood to die.
There are no more uses of "undermine" in the book.
Show samples from other sources
Her father had a way of undermining his sister’s lectures on the innate superiority of any given Finch: he always told his daughter the rest of it, quietly and solemnly, but Jean Louise sometimes thought she detected an unmistakably profane glint in Atticus Finch’s eyes, or was it merely the light hitting his glasses?
Harper Lee -- Go Set a Watchman
He cocked his head, trying on his "I’m so wholesome" routine, but his bloodshot eyes undermined his efforts.