decipher
verbUK /dɪˈsaɪfə/
US /dɪˈsaɪfər/
To figure out what something secret or hard to read means.
The detective used a special code to decipher the hidden message.
OTHER MEANINGS
2. To read handwriting that is messy or hard to understand.
It took me a while to decipher my doctor's note.
3. To understand the meaning of something confusing or unclear.
She tried to decipher the look on his face.
4. To convert text written in a secret code into normal language.
The spies worked all night to decipher the enemy's instructions.