What is "increase twist"

Increase \In"crease\ (?; 277), n. [OE. encres, encresse. See Increase, v. i.]

1. Addition or enlargement in size, extent, quantity, number, intensity, value, substance, etc.; augmentation; growth.

   As if increase of appetite had grown By what it fed on.
   --Shak.

   For things of tender kind for pleasure made Shoot up with swift increase, and sudden are decay'd.
   --Dryden.

2. That which is added to the original stock by augmentation or growth; produce; profit; interest.

   Take thou no usury of him, or increase.
   --Lev. xxv. 36.

   Let them not live to taste this land's increase.
   --Shak.

3. Progeny; issue; offspring.

   All the increase of thy house shall die in the flower of their age.
   --1 Sam. ii. 33.

4. Generation. [Obs.] ``Organs of increase.''
   --Shak.

5. (Astron.) The period of increasing light, or luminous phase; the waxing; -- said of the moon.

   Seeds, hair, nails, hedges, and herbs will grow soonest if set or cut in the increase of the moon.
   --Bacon.

   Increase twist, the twixt of a rifle groove in which the angle of twist increases from the breech to the muzzle.

   Syn: Enlargement; extension; growth; development; increment; addition; accession; production.