Breast n.
 1. The fore part of the body, between the neck and the belly; the chest; as, the breast of a man or of a horse.
 2. Either one of the protuberant glands, situated on the front of the chest or thorax in the female of man and of some other mammalia, in which milk is secreted for the nourishment of the young; a mamma; a teat.
    My brother, that sucked the breasts of my mother.   --Cant. viii. 1.
 3. Anything resembling the human breast, or bosom; the front or forward part of anything; as, a chimney breast; a plow breast; the breast of a hill.
 Mountains on whose barren breast
 The laboring clouds do often rest.   --Milton.
 4. Mining (a) The face of a coal working. (b) The front of a furnace.
 5. The seat of consciousness; the repository of thought and self-consciousness, or of secrets; the seat of the affections and passions; the heart.
    He has a loyal breast.   --Shak.
 6. The power of singing; a musical voice; -- so called, probably, from the connection of the voice with the lungs, which lie within the breast. [Obs.]
    By my troth, the fool has an excellent breast.   --Shak.
 Breast drill, a portable drilling machine, provided with a breastplate, for forcing the drill against the work.
 Breast pang. See Angina pectoris, under Angina.
 To make a clean breast, to disclose the secrets which weigh upon one; to make full confession.


 Drill, n.
 1. An instrument with an edged or pointed end used for making holes in hard substances; strictly, a tool that cuts with its end, by revolving, as in drilling metals, or by a succession of blows, as in drilling stone; also, a drill press.
 2. Mil. The act or exercise of training soldiers in the military art, as in the manual of arms, in the execution of evolutions, and the like; hence, diligent and strict instruction and exercise in the rudiments and methods of any business; a kind or method of military exercises; as, infantry drill; battalion drill; artillery drill.
 3. Any exercise, physical or mental, enforced with regularity and by constant repetition; as, a severe drill in Latin grammar.
 4. Zool. A marine gastropod, of several species, which kills oysters and other bivalves by drilling holes through the shell. The most destructive kind is Urosalpinx cinerea.
 Bow drill, Breast drill. See under Bow, Breast.
 Cotter drill, or Traverse drill, a machine tool for drilling slots.
 Diamond drill. See under Diamond.
 Drill jig. See under Jig.
 Drill pin, the pin in a lock which enters the hollow stem of the key.
 Drill sergeant Mil., a noncommissioned officer whose office it is to instruct soldiers as to their duties, and to train them to military exercises and evolutions.
 Vertical drill, a drill press.


 breast drill
      n : a portable drill with a plate that is pressed against the
          chest to force the drill point into the work