Punk is the same as “touchwood.”

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a. 1707.  As the East-Indians use Moxa [in blistering] so these burn with Punk, which is the inwart Part of the Excrescence or Exuberance of Oak.—J. Clayton, ‘Virginia,’ in Phil. Trans., xli. 149. (N.E.D.)

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1789.  Their proneness to fight like punk, whenever you attempt to steal their victuals.—American Museum, v. 298/1 (March).

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1792.  They [the Indians] raised a blister by burning punk or touchwood on the skin.—Jeremy Belknap, ‘New Hampshire,’ iii. 94. (Italics in the original.)

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1803.  Even in New-England, there is some timber so punky that the French saw might easily pass through it, particularly the little State of Rhode-Island.—The Balance, March 8, p. 75/3. (Italics in the original.)

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1821.  They made a fire with the aid of a flint … and some punk; a substance, formed by a partial decomposition of the heart of the maple tree; which easily catches, and long retains, even the slightest spark.—T. Dwight, ‘Travels,’ ii. 197.

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1876.  The fire is punky, and only smokes.—H. Bushnell, ‘Life and Letters’ (1880), p. 210. (N.E.D.)

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