This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of astringe.

"Yet an experienced physiognomist might have noted that the same lineaments which bespoke a virtue bespoke also its neighbouring vice; that with so much will there went stubborn obstinacy; that with that power of grasp there would be the tenacity in adherence which narrows, in astringing, the intellect; that a prejudice once conceived,"

astringent    stringing