To become less 'open' or communicative, to shrink back.
To heal a cut or other wound
To move people closer together.
To shut a building or a business for a period of time.
To riddle something with holes, especially in such a pattern.
A space-filling packing of polytopes in 3- or higher-dimensional space.
Any structure resembling a honeycomb.
A structure of hexagonal cells made by bees primarily of wax, to hold their larvae and for storing the honey to feed the larvae and to feed themselves during winter.
Voids left in concrete resulting from failure of the mortar to effectively fill the spaces among coarse aggregate particles.
Manufactured material used to manufacture light, stiff structural components using a sandwich design.
The texture of the surface of a solar cell, intended to increase its surface area and capture more sunlight.