\Un`der*work"\, v. t. [imp. & p. p. {Underworked}or
{Underwrought}; p. pr. & vb. n. {Underworking}.]
1. To injure by working secretly; to destroy or overthrow by
   clandestine measure; to undermine.
         But thou from loving England art so far, That thou
         hast underwrought his lawful king.    --Shak.
2. To expend too little work upon; as, to underwork a
   painting. --Dryden.
3. To do like work at a less price than; as, one mason may
   underwork another.

\Un`der*work"\, v. i.
1. To work or operate in secret or clandestinely. --B.
   Jonson.
2. To do less work than is proper or suitable.
3. To do work for a less price than current rates.

\Un"der*work`\, n.
Inferior or subordinate work; petty business. --Addison.