Bat n.
 1. A large stick; a club; specifically, a piece of wood with one end thicker or broader than the other, used in playing baseball, cricket, etc.
 2. In badminton, tennis, and similar games, a racket.
 3. A sheet of cotton used for filling quilts or comfortables; batting.
 4. A part of a brick with one whole end; a brickbat.
 5. Mining Shale or bituminous shale.
 6.  A stroke; a sharp blow. [Colloq. or Slang]
 7. A stroke of work. [Scot. & Prov. Eng.]
 8.  Rate of motion; speed. [Colloq.] “A vast host of fowl . . . making at full bat for the North Sea.”
 9.  A spree; a jollification. [Slang, U. S.]
 10.  Manner; rate; condition; state of health. [Scot. & Prov. Eng.]
 Bat bolt Machinery, a bolt barbed or jagged at its butt or tang to make it hold the more firmly.