What's the difference between pitprop and sprag?

Pitprop

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Definition:

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Sprag

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Definition:

• (n.) A young salmon.
• (n.) A billet of wood; a piece of timber used as a prop.
• (v. t.) To check the motion of, as a carriage on a steep grade, by putting a sprag between the spokes of the wheel.
• (v. t.) To prop or sustain with a sprag.
• (a.) See Sprack, a.

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