Source : Webster's Revised Unabridged Dictionary (1913)

Astringe \As*tringe"\ ([a^]s*tr[i^]nj"), v. t. [imp. & p. p.
   {Astringed} (-tr[i^]njd"); p. pr. & vb. n. {Astringing}
   (-j[i^]ng).] [L. astringere; ad + stringere to draw tight.
   Cf. {Astrict}, and see {Strain}, v. t.]
   1. To bind fast; to constrict; to contract; to cause parts to
      draw together; to compress.

            Which contraction . . . astringeth the moisture of
            the brain and thereby sendeth tears into the eyes.
                                                  --Bacon.

   2. To bind by moral or legal obligation. --Wolsey.

Source : WordNet®

astringe
     v 1: constrict or bind or draw together; "Lemon juice astringes
          the tissue in the mouth"
     2: become constricted or compressed; "The cold substance
        astringes"