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To make thick (in any sense of the word). Specifically:

To render dense; to inspissate; as, to thicken paint.

To make close; to fill up interstices in; as, to thicken cloth; to thicken ranks of trees or men.

To strengthen; to confirm. And this may to thicken other proofs. (Shak)

To make more frequent; as, to thicken blows.

Origin: Thickened; Thickening.