Mud"sill` (?), 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 laid at the bottom of the water. See Sill.
© Webster 1913
Mud"sill`, n.
Fig.: A person of the lowest stratum of society; -- a term of opprobrium or contempt. [Southern U. S.]
© Webster 1913