To encase means to completely surround or cover something, usually to protect it or keep it safe. When you encase something, you're putting a protective layer or container around it.

Think of how a phone case encases your phone, wrapping around it to protect the screen and corners from drops and scratches. Or imagine how ancient insects became encased in amber: tree sap dripped over them millions of years ago, hardening into a golden shell that preserved them perfectly. Museums display fossils encased in glass to protect them from damage while letting visitors see them.

The word suggests something completely sealed or wrapped up. A sword might be encased in its scabbard. Valuable documents get encased in plastic sleeves. Builders encase pipes in concrete. The idea is always the same: putting something vulnerable or important inside something stronger that surrounds it completely.

You might also hear people use encase more creatively, like describing how fresh snow encases every branch in white, or how a knight's armor encases their body. The outer layer forms a complete covering, like wrapping a present where every side gets covered, not just the top.