Other forms: refreezing; refrozen; refreezes; refroze
To refreeze something is to freeze it — change it into ice — again. If it's going to get cold enough for the melting pond to refreeze, you could be ice skating again by the end of the week.
Frozen water is called ice, which is water in its solid state. Ice starts to melt into liquid water when it's warmer than 32° F (0° C). It refreezes when the temperature drops back down below that. Similarly, when the power goes out long enough, foods in your freezer start to thaw. Those foods will refreeze when the power comes back on. But wait! It's not great to refreeze many foods. The quality and safety could be negatively affected. That's why many store-bought frozen foods say "Do not refreeze" on the package.