D defs.my
Entry 2 senses Webster, 1913

Mudsill

· Mud·sill · IPA
01 n. The lowest sill of a structure, usually embedded in the soil; the lowest timber of a house; also, that sill or timber of a bridge which is …
  1. 1.
    The lowest sill of a structure, usually embedded in the soil; the lowest timber of a house; also, that sill or timber of a bridge which is laid at the bottom of the water. See Sill. See: Sill
  2. 2.
    Fig.: A person of the lowest stratum of society; -- a term of opprobrium or contempt.[Southern U. S.]