underwork

v. t. [ imp. & p. p. Underworked r Underwrought p. pr. & vb. n. Underworking. ] 1. To injure by working secretly; to destroy or overthrow by clandestine measure; to undermine. [ 1913 Webster ]

But thou from loving England art so far,
That thou hast underwrought his lawful king. Shak. [ 1913 Webster ]

2. To expend too little work upon; as, to underwork a painting. Dryden. [ 1913 Webster ]

3. To do like work at a less price than; as, one mason may underwork another. [ 1913 Webster ]