solidify

verb4

1. •
   To make solid; convert into a solid body.
2. •
   To become solid; to freeze, set.
3. •
   To concentrate; consolidate, reinforce.

   • Emerging from Kennaway Tunnel, the train sweeps to the right, affording views of the recent work to solidify the railway here. — 2023
4. •
   To transform an open compound into a closed compound (solid compound).