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From The Collaborative International Dictionary of English v.0.48:
Underwork \Un`der*work"\, v. t. [imp. & p. p. Underworkedor 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]