thicken

verb7

1. •
   To make thicker (in the sense of more viscous).
2. •
   To become thicker (in the sense of more viscous).
3. •
   To make thicker (in the sense of wider).
4. •
   To become thicker (in the sense of wider).
5. •
   (literary) To make more detailed or comprehensive.
6. •
   To strengthen; to confirm.

   • And this may helpe to thicken other proofes,/ That do demonstrate thinly. — 1603
7. •
   To make more frequent.

   • to thicken blows