(1):

(n.) A young salmon.

(2):

(n.) A billet of wood; a piece of timber used as a prop.

(3):

(v. t.) To prop or sustain with a sprag.

(4):

(v. t.) To check the motion of, as a carriage on a steep grade, by putting a sprag between the spokes of the wheel.

(5):

(a.) See Sprack, a.