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The Collaborative International Dictionary of English v.0.48 (gcide)

Thicken \Thick"en\, v. t. [imp. & p. p. {Thickened}; p. pr. &
vb. n. {Thickening}.]
To make thick (in any sense of the word). Specifically:
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(a) To render dense; to inspissate; as, to thicken paint.
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(b) To make close; to fill up interstices in; as, to thicken
cloth; to thicken ranks of trees or men.
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(c) To strengthen; to confirm. [Obs.]
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And this may to thicken other proofs. --Shak.
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(d) To make more frequent; as, to thicken blows.
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