/
dɔːb/
v.
 carelessly coat or smear with a thick substance. 
▸spread (a thick substance) on a surface in such a way.
n.
   - plaster, clay, etc. mixed with straw and applied to laths or wattles to form a wall.
 - a patch or smear of a thick substance.
 - a painting executed without much skill.
 
Derivative
Etymology
ME: from OFr. dauber, from L. dealbare ‘whiten, whitewash’, based on albus ‘white’.