underdraw

verb4

1. •
   To sketch a work of art in chalk, pencil, or other temporary medium prior to painting, inking, or otherwise making the final work.
2. •
   To cover or line the underside of (a floor or roof) with plasterwork, boarding or other such treatment.

   • The [roof] had never been underdrawn, its entire anatomy lay bare to an inquiring eye, except where a frame of wood laden with oatcakes, and clusters of legs of beef, mutton and ham, concealed it. — 1847
3. •
   To represent inadequately in an artistic depiction, or in words.
4. •
   To take or draw less than one needs or is entitled to.

   • You say for month and months you had been underdrawing? — Always underdrawing and giving up every month. Whatever we drew the officer signed an indent for and we gave up a surplus. — 1906