underslip

under- +‎ slip

underslip (plural underslips)

1. A woman's undergarment.
2. (ceramics) An underlying layer of slip.
   • 2011, Walter R. T. Witschey, Clifford T. Brown, Historical Dictionary of Mesoamerica, page 336:

     The designs in the slip appear to have been created through a negative resist technique, in which a lighter-colored underslip shows through a darker overlying slip.

• underlips