thick·en /ˈθɪkən/
  (vi.)變濃,變厚,變得糢糊,變為複雜(vt.)使變厚,加強,使糢糊
  Thick·en v. t. [imp. & p. p. Thickened p. pr. & vb. n. Thickening.] To make thick (in any sense of the word). Specifically: --
  (a) To render dense; to inspissate; as, to thicken paint.
  (b) To make close; to fill up interstices in; as, to thicken cloth; to thicken ranks of trees or men.
  (c) To strengthen; to confirm. [Obs.]
     And this may to thicken other proofs.   --Shak.
  (d) To make more frequent; as, to thicken blows.
  Thick·en, v. i. To become thick. “Thy luster thickens when he shines by.”
     The press of people thickens to the court.   --Dryden.
     The combat thickens, like the storm that flies.   --Dryden.
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  thicken
       v 1: make thick or thicker; "Thicken the sauce"; "inspissate the
            tar so that it becomes pitch" [syn: inspissate] [ant:
            thin]
       2: become thick or thicker; "The sauce thickened"; "The egg
          yolk will inspissate" [syn: inspissate] [ant: thin]
       3: make viscous or dense; "thicken the sauce by adding flour"
          [syn: inspissate]