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.
adj 1: made or having become thick; "thickened bronchial arteries"
2: having skin made tough and thick through wear [syn: calloused]
3: made thick in consistency; "flour-thickened gravy";