1. (v. t.) To make thick (in any sense of the word).

2. (v. t.) To render dense; to inspissate; as, to thicken paint.

3. (v. t.) To make close; to fill up interstices in; as, to thicken cloth; to thicken ranks of trees or men.

4. (v. t.) To strengthen; to confirm.

5. (v. t.) To make more frequent; as, to thicken blows.

6. (v. i.) To become thick.

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