Decode (verb)

1. To convert (a message or text) that has been coded into a form that can be understood.
2. To figure out the meaning of something that is in code or a secret language.

Origin:

Mid 19th century: from de- (expressing reversal) + code.

Examples:

1. The researchers were able to decode the DNA sequence.
2. He was able to decode the encrypted message.
3. The detective had to decode the criminal's code.
4. The scientists were trying to decode the ancient script.
5. I am trying to decode the hidden message in the song.