Definitions of daub:

• noun:   an unskillful painting
• noun:   material used to daub walls
• noun:   a blemish made by dirt
• verb:   cover (a surface) by smearing (a substance) over it

  Example: "Daub the ceiling with plaster"

• verb:   apply to a surface

  Example: "Daub paint onto the wall"

• verb:   coat with plaster

  Example: "Daub the wall"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #15213)