The Collaborative International Dictionary of English v.0.48:

Thrusting \Thrust"ing\, n.
   1. The act of pushing with force.
      [1913 Webster]

   2. (Dairies)
      (a) The act of squeezing curd with the hand, to expel the
          whey.
      (b) pl. The white whey, or that which is last pressed out
          of the curd by the hand, and of which butter is
          sometimes made. [Written also thrutchthings.] [Prov.
          Eng.]
          [1913 Webster]

   Thrusting screw, the screw of a screw press, as for
      pressing curd in making cheese. [R.]
      [1913 Webster]